Just spent 4 nights here and would definitely stay again. The location is excellent--walking distance to many sites, lots of cafes and things nearby, and le Marais is a charming district. The rates were very reasonable by Paris standards, the staff was very friendly, and the room was comfortable. I also like the boutique feel and quirkiness of this hotel; it's certainly not a Marriott.
My room (9) was plenty spacious enough for me, if a little eccentric. The toilet was in a cubicle in one place, and the tub and sink were on the other side of the room. The tub had a handheld shower head with no stand (or curtain), which annoyed me. Otherwise, the room was well equipped and the wifi is free, if a little wonky.
With my window open, there was quite a bit of street noise. There's a club across the street and the guys are pretty loud until pretty late--even on week nights. On the other hand, the room was quiet if I kept the window closed, and the street was peaceful in the mornings.
I wouldn't bother with the hotel breakfast. There are plenty of cafes within a very short walk.
I'd definitel recommend this hotel.