The apartment is located very central in Mouraria and although it's in the ground floor, it has a light living room. It's clean and as shown on the photos. Anyway, the flat is fairly small. For a three person family like us it was ok (two slept in the bedroom, one in the living room), but I would not recommend to stay with four persons, especially as the bedroom doesn't have a window and you have to leave the door open. Also, as described in a few other feedbacks, the flat is very moist and has a moldy smell although there is a dehumidifier.
All in all we had a nice stay in Lisbon. João provided helpful information in advance of our trip, but we didn't meet him in person. Instead we were welcomed by Paula, who looks after the apartment. She is very nice and was very helpful concerning all questions of our stay.