Petya's apartment is in an amazing location, in the heart of the Alfama. We arrived during a major celebration and for the first few evenings of our visit the square below was filled with people eating, singing and hanging out. Noise wasn't a problem, though, because the windows were really sound proof. And although it was very hot outside, the apartment stayed cool.
There is a large living room and a good sized bedroom, so we had plenty of room to spread out and relax. The kitchen and bathroom are compact but very functional. The apartment was exactly as described in the listing, and we couldn't have found a better place to experience Lisbon. Highly recommended!