We stayed 5 days with Tom and Heidi and loved it.
t was peaceful compared to the middle of town and the room was infinitely better than what we could have got further in for the price yet it was very handy by tube.
Added bonus was being handy to one of only two city stops for the trains that go up the Hudson River for a real break from the city.
Tom and Heidi were great hosts and we hope to see them in NZ at our place some time.
Harlem itself was a good base - safe and interesting. NYC seems to be a city that keeps transforming and felt very safe and friendly to us.
Definately and wholeheartedly recommended.