Pros: Thanks to Monica for being so responsive during our stay. Monica was incredibly communicative and accommodating, and she showed willingness to help in the case of any difficulties. This apartment is right in the heart of Buenos Aires, and it is close to many cool attractions as well as all of the transportation routes that can take you to other parts of the city. The apartment is great for people looking to feel the New York side of Buenos Aires: an abundant commercial district, quick access to the shows and theaters, constant activity throughout the day and night, street performance, hustle and bustle. The description of the apartment in the Airbnb post is very accurate, as are the pictures, so you'll know what to expect. In our experience the apartment has great value for a group of 4-5 people looking to stay for a short period of time.
Cons: The apartment itself was clean and well maintained, but the building was less so. Lack of building upkeep led to there being bugs and pests (mosquitoes, cockroaches, earwigs, a mouse sighting) in the apartment regardless of how clean the space was. During our stay there was also a problem with water leaking into the apartment after heavy rains and soaking one of the beds—check with Monica to see if that's been resolved if you will be staying for a long period of time or in the rainy season. Also, as mentioned above, the room is accurately described on the Airbnb page: the kitchenette is small (though fully stocked!), and there is only one bedroom. For longer stays with more than two people, the apartment gets cramped; our stay was for a month, three people. Finally, at least in early 2017, the Microcentro isn't an ideal location. There are a lot of construction projects (part of a temporary citywide campaign), which produce much dust and noise. There's agitation in the streets during the day and at night. One night we were approached and threatened by a group of people, and on another occasion one member of our group had a bag taken while he wasn't looking. Given this, the building security was quite weak: the main door was constantly left open and unattended, and non-residents were clearly gaining access to the building. Some members of the building were also running illicit operations out of their apartments, which didn't help the sense of security.
Some of these problems will resolve naturally over time (eg., construction), some can be improved by the host (eg., rainwater leaks), and some might change as the political/economic situation changes in Buenos Aires (eg., agitation in the streets). So since this review is only about a month in early 2017, it's worth doing additional research and reaching out to hosts to follow up on things you're curious about. Have a great stay in Buenos Aires! It's a wonderful city!