Spent 4 nights here in July and would definitely stay again. The location is excellent with lots of cafes, restaurants, shops and sites nearby. The metro (Hotel de Ville metro stop) is a couple of minutes away.
The room was charming and cozy. The bathroom was very clean and modern. There was no air conditioning, but the room had a fan. Though Marais can be a bit loud - especially on the weekends, it didn't really bother us. However, if you prefer a more quiet room, ask for a room overlooking the inner courtyard.
Also the front desk is open 24/7 and the staff is really helpful and friendly - and will gladly help you make dinner reservations. Free wi-fi was also available.
The last day of our stay, we forgot our sunglasses at the hotel. We didn't even notice until the reception wrote us an e-mail and offered to send them back to us free of charge. Lovely!