The location is fantastic. Close to Subte station and the 55 bus (stop in Serrano) will get you up to Palermo Soho (where you wi find a better selection of pubs and restaurants) in no time. The bus comes back along Thames and deposits you right outside the department.
Lucas is a truly fantastic host - he really cares - and I could contact him easily by Whats App. He even topped up my Claro account when I was in Chile. When the pilot light went out I called him and we fixed it immediately. He is always available when the house is let, and the block has a concierge, who can fix things.
The flat is spacious and has a balcony offering, well, I won't say beautiful views, but nice views. The bed is comfortable, as is the sofa. The TV has Netflix and Amazon if you feel like staying in. The air con works well.