I found Petite Auberge a very comfortable place to stay. The room had the little things that make a place comfortable: sitting chairs, good light for reading in bed, lots of shelves in the bathroom, a full length mirror, lots of drawer space, free wifi. And that doesn't even touch on the free breakfast and h'orderves w/ wine! I always find it a hassle when traveling to just sit down to relax a glass of wine in the evening or get a lite breakfast, so I really appreciated it. The buffet breakfast was sausage, quiche, fruit, various baked goodies, oatmeal, cold cereal, and toast. Not a big fancy affair like a B&B, but clearly better than the "continental breakfast" a lot of hotels serve. There was a small breakfast room, plus a sitting area with several small couches. This would certainly be a nice area to sit around drinking coffee all morning.
I was there on a weekday and they shared a front desk with the White Swan two doors down.
The building is older and squeeks a bit. We didn't have problems with loud neighbors, but I imagine there could be problems.
The location is good -- a few blocks (though with a hill) from Union Square.
One thing I didn't like: the floral wall paper. Yuck!