Javier has a lovely place we stayed for over 2 weeks, in the heart of the Chacarita neighborhood. Quite a ways away from the city centre, but fairly reachable through taxi or any subway lines. There's a gym and laundry room in the building, the conference room is not accessible unless booked in case you plan to work there like we did. The apartment itself is a one space but still very nice. 1 very minor bad thing: The shower works in a weird way where every minute it goes way colder and way hotter than the temperature you set it at. It never gets like so hot or so cold it hurts but it's definitely very annoying.
Other than that it was a fine stay.