Urban Hostel Bangkok was an excellent private room with bathroom for a very reasonable price. The size of the room was fantastic, and the bed was very comfortable. I was grateful for the powerful AC too. It was also wonderful to have fresh bottled water provided by the hostel. I thought the building was clean and up to date. WiFi was decent, too. The staff was also friendly, and check-in was hassle-free.
The only thing that was a downside for me was the location. It was a bit of a walk from the MRT station, and since it was my first time in Bangkok, I was unprepared for cutting across traffic (but I got used to it). You also have to walk a little ways to get to any convenience store. But otherwise, it's a wonderful hostel and I would definitely stay again.