This apartment is very comfortable and in a fantastic area. We loved San Telmo. It's not the typical tourist area, and you need to be a bit careful when you're walking around. It's not recommended to be out walking around too much at night. However the San Telmo market and neighborhood restaurants are fantastic! The building is incredible with wonderful heated pools, sauna, and a nice gym on the top floor. There's also a space up there to sit and hang out, eat, or use your laptop. I don't know if there is wifi on the top floor, but it has small tables and chairs.
All of my interactions were with Mario rather than Andrea. He was extremely friendly and helpful, giving me ideas on taxis and our first night in the apartment.
We were a little surprised that we couldn't make the bathroom window close, but otherwise we loved the little apartment! It seems the lock is installed backwards. Otherwise, we really enjoyed our week there, and I would definitely return.