I got in late one night and stayed at the river guesthouse, which is their older smaller property. This was definitely a step up. Clean with a fan and ensuite bathroom for a mere 300 baht. The lower level has a small pond creek thing full of koi. The roof has some patio furniture on it and a great view of the river.
Good if you want to be near but not in the Khao San backpacker area. The short walk to an express Chao Praya riverboats are a good way to get around and get to a BTS station. Staff are friendly if with limited English. I had an ant problem in one room, which they quickly sprayed for me. They then changed my room for me when ants returned. Wifi can be hard to get in rooms.