I stayed at Bill's place with a friend for the duration of a conference at Columbia University. For this purpose, the place was perfect. The apartment was about 30 minutes walk from Columbia University and was very cosy with great WiFi and a well equipped kitchen. The bed was really comfortable and, given how cold it was outside, the apartment was lovely and warm.
We had some problems contacting Bill when we arrived - we called him but his phone just went to answerphone. We didn't know he lived downstairs, which would have been helpful as he was in and we could have just knocked! Otherwise, Bill was very helpful with any other queries and check-out was very smooth.
Thank you for having us!