We were a group of 11 students who passed 8 nights in this flat and had really a great time there. The welcome by João's collegue was very friendly and the smaller problems we had with a licking pipe were immediately fixed. Besides, the location of this flat is just perfect: the metro and tram stations are in a walking distance, as well as supermarkets, bars, restaurants, the city center and the river. Moreover, this location offers all you need during your stay in Lisbon: kitchen equipment, a big living room where you can relax and hang out together and nicely decorated bedrooms with comfortable beds. The rooms are a bit small for three people sleeping inside, but apart from that very cosy. We were there in January and as it is an older building, it was a bit drafty. However, it was made sure that there were heaters in all of the rooms. And as we passed most of the time outside, this was not such a big problem.
Finally, the apartment is very tidy and clean, the only negative point I need to mention is the mold in one of the bathrooms.