Gaspar's place is very convenient, since it is close to Intendente subway station (5 min walk). His sister welcomed us and did the check-in.
However, note that there are 4 flights of stairs to go to the apartment, which can be a hassle for people with big suitcases. The apartment is on the last floor and the ceiling is low at some corners of the apartment (i.e the entrance, where you have to duck a bit). Once inside, it is very spacious and includes everything.
The shower drain doesn't work properly, and water can leak a bit outside, Gaspar is aware and said he would address this issue.
Otherwise, very nice stay and close to restaurants and public transportation. The tram 28 passes next to the apartment.