The place is nice!
Very comfortable and with all the necessary things for a some days visit to NYC.
If you go on summer, I recommend to talk with Christopher about air conditioner because believe me, you will need it.
The place doesn't have natural light and kitchen, although it has microwave and refrigerator for fast meals. Also there are a lot of restaurants, coffees and deli store near.
The place is located 5 little blocks away from the subway station and 2 blocks away of the bus stop.
In harlem is very usual to see a group of people in the corners so it could be a little scary at the beginning, mainly at night but everything it's fine and I didn't saw or heard something wrong near the place or during the walks for the bus or subway.
Definitely, I would stay again at Christopher's place, who also would be ready to help you with all your doubts!