The house is great, just make sure you don't have an internal room (room 6 and room three I think) during the summer months because it will make your stay much less enjoyable.
Pros: Vicky is really nice and responsive. She is always happy to help and give suggestions of things to do and places to visit; The location is AMAZING. San Telmo is a great place to stay and the apartment is in the middle of everything; The rooftop terrace is great for summer days and nights. Its a nice view and there's a Argentine grill for your use.
Cons: The main con is the fact that this room does not have any windows and it's on the upper level. It gets insanely hot up there and there's no air flow. I had to sleep with the door open to get the little bit of air from the windows in the hallway, so I didn't have privacy at night. Even with the door open the room was uncomfortably hot during the summer months. It's probably fine March-November, but when I stayed in January and February, the heat was unbearable (I did stay for 3 weeks in March and it was ok with the extra fan Vicky gave me). Make sure to check in to make sure you have a room with windows before booking if you are coming during the summer.