I stayed in Martin's apartment for 10 days with my brother.
The location is great in Palermo Soho which is a more hipster/grungier neighborhood of BA but filled with great restaurants, bars, and shopping.
It is appropriate for two people, tight squeeze for three. Bathroom is small. Limited closet space.
The place was relatively clean and you essentially get what you pay for.
5-10 minute walk to the subway, grocery store is very nearby, great empanada place across the street.
Very safe area, apartment itself was quiet, and lots of people walking around during the day and night.