My wife and I and our daughter spent 8 nights at the apartment in early April. We loved our stay. The apartment occupies the first floor of a row house. It has two good-sized bedrooms, each with a full (not queen) bed, one small bathroom, a kitchen, and a living room/eating area. There is good closet space in the bedrooms and living area. It's not a large apartment but certainly adequate sized. I believe it would be fine for 4 adults; 6 would be difficult, especially with the bathroom. The apartment was clean.
We had two minor issues come up during our stay. Luis and his wife promptly responded to address the issues. Luis also provided excellent communication in the weeks leading up to our stay. Check-in was easy and we were able to drop off our luggage early the first day.
The apartment is located a short walk (4-5 minutes) from the 149th/Grand Concourse subway station. The station provides direct access to the Bronx Zoo to the north and Manhattan and Brooklyn to the south via the 2 and 4/5 trains. The Metropolitan Museum of Art was a 15-minute ride; midtown was about 25 minutes, and lower Manhattan was about 35 minutes. Late night trains were not a problem and we felt safe walking from the subway station to the apartment even late at night, though there were three of us together. The apartment is a half mile from Yankee Stadium; we walked home from a game.
We drove our car to NYC. Street parking at the apartment was free but was a bit difficult as we competed with Yankee Stadium traffic, students at the nearby community college, and other local residents. Due to the street sweeping schedule, we had to move our car several times. We recommend that, if you can't get street parking on the street in front of the apartment to pay to park at the Bronx Terminal Market (mall) a few blocks away rather than parking on a nearby, desolate street. Having a car allowed us to drive to the Met Cloisters - a 15-minute drive compared to maybe an hour ride/walk via public transportation; we loved the Cloisters and highly recommend it if you have a car and appreciate medieval art and architecture.