Derrick's apartment is a terrific home base for a weekend in NYC. My friends and I (9 adults in total) stayed there for a weekend and we had plenty of space and all the creature comforts we needed from extra pillow, blankets and towels, to AC units and heaters. There are also tons of good restaurants and bars within walking distance of the apartment! We were a few blocks away from a subway, and it was less than 25 minutes to get to the center of the action in midtown. Derrick was very responsive and answered all of our questions.
The full sized beds were all very comfortable! The room with bunkbeds worked fine for 1 adult, but we probably wouldn't have felt good about having a 2nd adult up on the top bunk. Should be totally fine for 2 children though.
Additionally, our group went to an event at Yankees Stadium and we were able to get the whole group to the Bronx in less than 30 minutes using 2 Ubers that were about $30/each.
I would definitely stay in this space again if I had a small group going to NYC for a weekend!