I stayed in the flat for a month, and it was excellent - it is in a great part of town, near to the nightlife centre of Buenos Aires in Palermo Soho. Very safe neighbourhood with a police station and gym across the road.
The flat is nice, with all the amenities you could need, and plenty of space for a studio. The door staff are very friendly and helpful!
Jonathan is an excellent host, with very quick response time, and taking the time to check in.