I had a great time at Candes and Matis place. Both of them were very flexibel, always there and helped when I had any questions (thanks again). Since Matis is working in the flat he is everyday around. Beside this it was great sharing the flat with 4 other guys who stayed either longterm or just some weeks/days as I did. There was always someone in the kitchen cooking or in the livingroom to talk to. Since there are doors in the rooms who connected them earlier you sometimes hear some noises, but it is a shared flat so I was fine with it!
The flat is close to Avenida de Mayo and 9 de Julio therefore you can visit the main sights and even San Telmo easily by foot. Or you take one of the subtes or busses which stops in the area. Very convenient! The street is crowded at daytime but at nighttime there is no one in the street. But since it is just one block from the big streets I never had a problem with it or felt unsafe.
Since I am coming back to BA in the end of my trip I am trying to stay there again.