We (5 friends from different parts of the world meeting up in Buenos Aires) stayed for 5 nights at Javier's place and we loved every minute of it. The spacious appartment is located very centrally and has all the amenities you need for a pleasant stay in a bubbly neighborhood. The varanda is FANTASTIC and you really feel like a local when you sit there, drinking your wine, looking out over the trees and buildings of Buenos Aires. The kitchen is large enough to have breakfast with 5 people and there is also a table in the dining room. The 3 bedrooms are simple but comfortable.
Communication with Javier went very smoothly. He always responded very quickly. His mother (such a sweet women) opened the door for us and explained everything very clear.
I hope we didn't disturb the neighbors too much with our festive mood, as we felt so much at home at the appartment that we were always singing and dancing.
I strongly recommend this place.