Shahar's apartment was exactly what you are looking for as a home base in the UWS. It was clean, spacious and convenient to pretty much everything!
Check in was a breeze and Shahar was easily contactable if we had any questions.
The local neighborhood was great too if you just want to law low for a day or two. Central Park is just a short stroll away, and there are great restaurants and bars at every turn! (Joes bar and Land Thai are two we can recommend.)