I was pleased with my stay at Sawatdee Guesthouse.
The facilities are very clean and the location is convenient, within easy walking distance of the Khao San Road area and an quick tuktuk ride to other sights. The rooms are simple but are decently sized and the bed is comfortable. I stayed in a fan-cooled, no A/C room, though, and that was a mistake on my part.
I definitely recommend this property. You can probably find cheaper places to stay if you’re on a super-tight budget, but it’s worth a few extra bucks for the cleanliness and comfort of Sawatdee Guesthouse.