Positive: Victoria was very nice and easy to get in touch with before and during our stay. She was very accommodating regarding our requests and check-in/check-out times and gave us super helpful pieces of advice on where to go in Buenos Aires (especially if you are interested in seeing tango like a local!). She even left fresh fruit and water in the flat for us to use.
The flat itself is centrally located in a very nice area and also very quiet because it is facing an inner court. Inside it is very spacious and super clean, it can accommodate easily 4 people. The beds were very comfy and we had a lot of storage space.
Negative: because it is facing an inner court, the flat is quite dark and cold. You cannot really tell if the sun is shining outside or it is raining unless you put your head out of the window. Probably some heating system would help, especially to fight the humidity, but maybe that's just me because I suffer a lot the cold and the lack of light. Anyway, you'll probably spend most of the day outside so it won't make a great difference if the flat is dark at night.