We stayed for 6 nights at the appartement. It was very clean and everthing worked fine. We especially loved the nice terrasse. We didn't meet Mariano but he was always accessible promptly via email. He was very accomodating for the check-in (we arrived late) and check-out (we wanted to leave late!). The appartment is in a great neigbohood (We love San-Telmo) and close to everything. As everyone mentionned, the sofa bed is very unconfortable (but we knew this before hand). Good for one person or two very light people. The outside noise from plaza Dorego can be a bit much on the weekends, but tolerable. However, the other appartments (there are 4 in the building) can be very noisy given the right (or rather wrong) circomstances : A family or gang of friends rented 2 or 3 of the other appartments and were always in the stairs and screaming day and night... for 3 or 4 days during our stay. I guess that this isn't the norm but we were woken up frequently... I still reccomend the studio because i'm sure it can but quieter than this but bring ear plugs just to be sure !