This was place was amazing book it now before its gone! I am going to write a family based review since I did not see any others. My wife, myself, my two young kids and two of their aunts all stayed here comfortably so it's a big place especially by NYC standards.
The location is prime you DO NOT need to rent a car the 2 & 5 trains are about a 3 blocks walk and the B & Q lines are about 6 blocks away so and from there just take local buses and the ferries that run up and down the east River. Get the Metro pass if you are riding more than 12 times (trains or busses) which is easy to do. From there you can get anywhere you need in NYC just be aware the Metro system changes up on weekends and can be a little harder to navigate but thanks to google maps you can manage. As far as strollers are concerned the 2 & 5 station does not have an elevator so carry the stroller down to the platform. The B & Q does however have an elevator.
Guerline is a truly great soul and she kept in regular communication about things going on in the area or potential issues with events in the area like a marathon going on when we arrived. She saved us on our 1st morning with whole milk already in the fridge for our 15 month old since we had not done a grocery run yet!
Flatbush is an amazing Caribbean neighborhood in which we never felt unsafe or unwelcome and there are plenty of restaurants and delis in the area so finding a bite to eat was never an issue. There is some street noise like sirens and music occasionally from neighbors but to me this is just NYC flavor. The apartment is on the 2nd level and it has its own door and keypad lock so coming and going was easy. We had so much fun on this trip and am looking forward to another visit when my kids get older.
P.S If you have time check out the Highline and Chelsea market these were my personal two favorite places to visit.