If you don't mind simple accommodation, then the Sawasdee Banglumpoo Inn might be for you. I wanted to stay on Khao Sarn Road, kind of the backpacker mekka in Bangkok but there is much more to this road. The Sawasdee looks much better than the standard "guesthouse" and is better organized. I like to have at least proper security and some service on my trip even if I stay at a cheap place. Here you get both. For Kao Sarn this place belonge to the better ones.