Fabian's place is in a great location - a quiet, safe neighbourhood that contains many of Buenos Aires' up and coming restaurants and bars. Lots of ding options within walking distance, as is the subway. The apartment is in the rear of the building (i.e. off the street), so it's extra quiet. The upstairs neighbours can 'thump around' sometimes, so it's not totally silent, but for a place in a major city, it's hard to beat for peaceful.
Fabian is a great host - promptly responding to enquires before we came and checking in on us multiple times during the week we spent there. We'd rent this place again without hesitation.