The K79 Room Hostel is a good clean and cheap hostel in Bangkok. It is for low budget backpackers and is one of the better backpacking hostels in Thailand. The price range is from 400฿ (US$14) to 800฿ and this is really low. Check them before hand for the updated prices. The hostel is well known, centrally located and clean. This is close to the BTS On Nut Station.
K79 Room Hostel
If you are looking for another budget stay in Thailand you might also look at the listing of the Nantra Ekamai Hotel which is in the 700฿ range but has more amenities than this hostel. Both are located near the BTS Skytrain system so getting around is very easy. The K79 Room Hostel is located near the BTS On Nut Station. There are only two reviews on the Agoda system and both are very positive as they had been solo travelers to Thailand. The hostel is considered clean, nothing better for a budget traveler and best of all there are loads of budget stores around including a Tesco store. All within walking distance.
The hostel is considered a 2 star hotel in its ratings and provides room service, laundry services and also WiFi in the open public spaces. Note that this hostel considers children over 7 to be adults and will be charged accordingly. If you are a backpacker to Thailand then consider the two options and also ensure that you have a Thai tourist visa before you arrive as immigration rules do change in Thailand. If you are using the time to see Thailand then the Ekkamai Bus Station is where you will find a starting point. Finally, other hostels include In a Box Hostel as well as Saphaipae Hostel, Siam Journey Guesthouse and Hua Lamphong Hostel.