When it comes to coffee these guys know their onions! Having spent a couple of hours in Quantum chatting with the owners I quickly came to realise that they are clearly passionate about what they do. I tried around four different styles/types (?) of brew with beans from different countries - the tastes and flavours were extraordinary. I love food, and love cooking, and I can honestly say that it has been an absolute pleasure spending some time with them. The coffee they serve is superb. I would wholeheartedly recommend Quantum as a place to visit and sample their wares. If you have the chance, try some of their cold brew, and if you're not driving have a bottle or four of their Quantum Gravity beer - you wont be disappointed.
A brand new find has become my new favourite coffee shop. Stylish cool decor and very friendly service. The coffee tastes amazing. I recommend trying the Cortado . I wish I had a shop near where I live, I'd be in every day. :-)
Fantastic staff with fantastic coffee, probably one of the best coffee shops in Cardiff !!
Knowledge and friendly staff. Had the best drip coffee that I've had in Cardiff. Clean, fresh and expertly prepared. Happy coffee drinker!
Great coffee, great service, and awesome to see them using Oatly barista too.. highly recommend!
Passionate coffee aficionados. Would recommend stopping by for a cortado or any of the single origin on offer, choose from V60/Chemex etc.. Great little spot
Amazingly lovely artisan coffee experience with the friendliest, most welcoming and knowledgeable hosts you could ever wish to meet.
Such a relaxed and comfortable environment and atmosphere that I had to be dragged out kicking and screaming to go to work...
Obviously I can't recommend this wonderful oasis highly enough. My only problem is that I live in Bournemouth and the Quantum Coffee Roasters are in Cardiff...
Can't wait to go back
Extemely friendly staff, brilliant hot chocolate made from real dark chocolate, comfy chairs and great music.
Apart from excellent coffee, they now have best tasting beers!🍺🍻🎉
Fabulous coffee and d licious cakes in a chilled coffeehouse. Just what we needed!
I work from home and very often will spend the bulk of my day in Quantum. I don't drink coffee but there are plenty of positive reviews about the coffee here. The tea is lovely and if you get the chance, do experience their hot chocolate.
I have only ever felt welcome - whether I am here for an hour or four. It's family run - which makes a change amongst the pretty soulless coffee chains in the Bay.
best coffee in cardiff. really nice atmosphere and the dude knows his stuff.
Great coffee. Great tea. Great food and great music.
One of the best Coffee Shops I've been to, end of. Friendly, clued up staff, wonderful lighting and sockets everywhere. An awesome addition to the bay.
Nice cafe just round the corner from Cardiff Bay. Friendly staff and very relaxing atmosphere. They carry a variety of beans although they are for sale and you can’t choose what your coffee is made of.
On my visit the only choice for a drip (filter) coffee is from Yunnan China. Coffee was nicely brewed but a little too weak for my taste. I still enjoyed it though. It’s always nice to have freshly ground and brewed coffee.
We had a good experience over there. Flat white has a good balance and V60 on Chinese beans was also good. Thank you
Lovely and atmospheric coffee place in the heart of Cardiff Bay. Flat white circa £3.00.
Lovely coffee shop with friendly staff and really nice coffee, I was shocked that a flat white was £3, when Costa serve up an inferior one for £3.75! Very clean and nicely decorated.
I had a pleasant time in the cafe. Wonderful Nitro Cold Brew with delectable blueberry muffin. The overall atmosphere felt cosy and the baristas were welcoming and helpful.
Lovely coffee shop with a great atmosphere, the latte and brownie were delicious!
Had a trip down to Cardiff bay for a short break and was anxious I wouldn’t be able to get my usual morning coffee fix.
After a quick google, we found Quantum Coffee Roasters and decided to give it a go.
Service was excellent- friendly, helpful, didn’t feel rushed or pressured. Ordering was painless, easy, and enjoyable. The atmosphere was calm and cosy. I had second thoughts about getting a take out!
And, mostly importantly, the coffee was great. Really excellent. Not bitter, not sour, bang in the sweet spot. The oat milk was also steamed to the right temperature. Which quite a few coffee shops seem to get wrong and burn the milk (and my tongue!).
We managed to visit twice during our stay, and both times were exactly the same. Even with different baristas on both days. Always friendly and made perfect coffee.
It’s a shame that Quantum Coffee Roasters isn’t near my home!!
Will definitely be visiting again the next time I’m in Cardiff bay. Couldn’t recommend highly enough.
A pleasant place with very tasty coffee and a relaxing atmosphere. Here you can also have a healthy and nutritious breakfast.
Been using Quantum for some time, mainly ordering coffee beans online and also been into the shop in Cardiff Bay. Really like their coffee, it is priced reasonably and they are reliable. Can’t ask for any more than that really!
Their shop in Cardiff Bay has a nice aesthetic and good selection of food items.
One of the best flat white and ice latte I’ve ever had! The coffee bean they’re using is more on a nutty note, perfectly roasted. The cakes were a surprise too! We ordered one lemon, chia and pistachio muffin, and a pistachio cake. Both were fragrant and there was even lemon filling inside of the muffin!
The overall vibe is cosy with plenty of sunlight flashing in the place :)
Coffee was very good. Not a huge fan of the place itself but you gotta respect the coffee craft 👌
The best coffee I have had in Cardiff, I order V60 it was great.
An error has occurred! Please try again in a few minutes