Not bad! Not bad at all for the Upper West Side
I stayed here for one night in June 2012. The hotel was undergoing lobby renovations at the time, so walking in and out wasn't exactly pleasant, but I'm sure it'll be awesome when it's all done. 
I had an issue with the sink, and someone came to check it out within 10 minutes despite being busy with other guests at the same time. That said a lot about the way the hotel treats its guests - they take them seriously and seem to treat them with respect. Everyone was also very friendly, which is not always what you expect in a place like New York.
The room itself felt a little stale in decoration and features, with the window air conditioner and the funky angles, but it's still hard to complain about the hardwood floors. And the hotel is not cookie-cutter - the rooms differ enough that it's hard to judge based on just one.
The location is not exactly at the center of the action, but that's really not such a bad thing. You're two blocks from the subway. You're in a more peaceful part of town that doesn't have all the craziness of areas further downtown. Generally speaking, it seems like a well-kept secret, as long as you don't mind being in the west 70's. And if you're going to Lincoln Center... well, it would be hard to find a better value hotel than this one.
On balance, whatever the hotel lacks in charm, it more than makes up for in location, amenities, and especially the cheerful staff.