This place is great! We stayed for 3 nights with two small kids.
Our trips into Manhatten were easy with subways just 2 mins walk away. The convenience was crucial given that we stayed during NY's heatwave. So the short time spent commuting and the easy walk was a super plus for our 5 year old.
We enjoyed 2 cafes: Building on Bond (Boerum Hill) and Smooch (Fort Greene), and went to multiple parks in Prospect Park and Fort Greene, hanging out with other parents and nannys so we felt like real locals. If you have small kids and intend to visit parks in the summer, take swimmers so they can play in the kid's fountains.

The apartment was roomy and pleasant, and we felt at home straight away. Something that did not bother us but could be good to know is that the place gets pretty warm with no A/C. However this week has been unusually warm (today 36C/97F) so this may have just been exceptional circumstances. The building's entrance hallway is ugly but it added to the NY experience! It was also quickly forgotten as soon as you step into Marta's place.
Marta was very responsive, helpful and friendly.
We loved our brief stay in NY thanks to the relaxing apartment after 12 hour long days out and about in the city.
Thank you Marta!