It is exactly as described—so much so that I'm not sure what to add. I found it clean, quiet (which can be hard to find in apts in NYC), instructions/how to's/recommendations well laid out, everything easy and better than expected, and the morning light through the front windows is truly lovely. Mark himself is kind, authentic, and interesting—and was very helpful with arriving and accommodating my late flight on the day I left.
Saraghina, less than a block away, is a major asset to the neighborhood, and between the bakery in the am, the cafe area in the day for online work, and the restaurant/bar at night, I'm only slightly embarrassed to say I went there everyday.
This is one that I'm hesitant about sharing with folks, lest it not be available when I want it. ;)