My friend and I stayed three nights in August at Joao's flat and we absolutely loved it! The location in Barrio Alto is perfect for sightseeing, restaurants and clubbing. It was also very quiet (more than I had imagined). Joao is very friendly: he gave us suggestions on sightseeing/cafés/luggage storage and helped us to use the cooler he had set up in our room. He is very responsive. The room and shared bathroom were very clean and spacious. The only thing to note is that the flat is on the fourth floor so you need to be able to climb those stairs, but that was not an issue for us. Both my friend and I would like to book again with Joao when we return to Lisbon so five stars to him!