For Thai conditions it's a bit costly, but it has perfect location and is simply nice place to stay.
I strongly recommend visiting this hostel :)
If you book an ensuite room, you'll have to walk via corridor anyhow :) It's worth mentioning. Apart from this - I strongly recommend :)
Hostel is nicely located, but there are many other hotels in the same building and people trying to make you change your location are irritating. Definitely, you feel like in Asia ;) Atmosphere is poor - I recommend making better common room. On the other hand, you've got very good access to MRT, clean rooms (cleaned daily), secure environment (nothing was stolen etc.)