We enjoyed staying in Joao's place. The apartment is clean, cozy and has everything we needed for 6 days in Lisbon. The location is good, very close to the castle and you can easily reach a metro station from there. Paula was very nice, flexible and she explained everything in clear English. The place is a bit noisy, being on the ground floor of a building located on a busy street (the 28 tram goes by) and not very well ventilated. The air inside is moist with a touch of mold, but 10 minutes with the windows open can get rid of it. Perhaps the humidity from the kitchen and the bathroom is not very well evacuated.