Laurent's apartment is even better than what the pictures suggest. It's very comfortable and has all you'll need to spend some time visiting the city. Needless to say, it was impeccably clean, and it was more than well lit.
The only 'but' of our stay was in no way Laurent's fault: Harlem is a very vibrant area by day, and there is no reason at all to feel insecure for the best part of the day. However, I would advise some caution with passers-by by night; when there are fewer people out on the street, it's best not to appear to be in a rush to get back home: someone did take exception at that, which lead to some very ugly minutes. Still, this is something about which the owner can do nothing.