Came to this place whilst meeting up with friends who live close to Denmark Hill station. It was 7:30pm last night and the queues were out the door so they took our name and number to call us when a table was ready. Went off the nearby pub for a casual drink and came back 30mins later. We took our seats in the lower section of the restaurant. You could see the big wood fired oven churning out pizzas. We orderd our starter of aubergine parmagiano and our 3 pizzas (margarita, the sausage and the anchovies). The order took longer or we sat so secluded in the corner that we might have been forgotten! We asked if our pizzas will arrive soon as I had to get my train back home. 10mins later the pizzas came but not the starter. The waiter said it will be a few minutes as they had to make a new one. Anyway, then all our food came, the pizzas were deliciously; light, slightly chewy in context they used a sourdough for their pizza bases (the best dough in making pizzas, I think!).
From the facade, Theo's does look like a pizzeria but on the inside; the decor is simplistic, whitewash walls, feels like walking into someone's kitchen than a restaurant. The pizza oven is definitely a stand-out feature as every pizza are made to order.
We were all satisfied but one thing from giving a 5-star was the service that was slower than usual as I am told. I understood it was busy but it was a Thursday night, the waiters needed to step up a notch with organisation when its busy. Overall, the pizzas are great, not disimilar to Franco Manca. Would I go back again? Yes I would and it shows the queues; must be a popular outlet in the neighbourhood.

Best pizza in south London. It's unfair if it's underrated due to the location. I support it, but try to have a variety! For example you can also provide some pasta choices.