The backpacker's paradise, Suk 11 (in Thai,
Suk seep-et) offers plenty of atmosphere and a great location - just off the popular shopping district of Sukhumvit Road. The main lobby offers tables, games, music, and some souvenirs for purchase. There is plenty of information available about the surrounding areas. From there, you have to walk up a flight of open stairs to get to the accommodation areas, and from there you may be up several floors of narrow staircases.
My room was on the low end of this budget hostel, but was roomy, cool, and comfortable. Shared bathrooms were nearby. Just down the hallway there was a much fancier area, where I assume the rooms were nicer but more expensive. My favorite part of this accommodation, though, was the roof. A walk up to the top of the building took us out onto a gorgeous patio with beach furniture and outdoor showers. It also offers a gorgeous view of that part of the city, especially at night.
Suk 11 is patronized by backpackers from all over the world and is tourist-friendly, if not a true picture of Thai culture. However, this is truly a great value in a great location. There is an all-night market just outside offering traditional Thai treats, plus a 7-11 on the corner. Plus, if Sukhumvit Road isn't enough, the Skytrain is just a short walk, and with Bangkok's horrendous traffic, you'll be glad to have this quick transportation nearby.