Stayed here for 3 nights in 223.
My room was on the 2nd floor, as were the shared bathrooms. AFAICK, that was the case for each floor.
The bed was a double, came with a private light and 3 (yes 3) electrical points. The mattress was medium firm and super comfortable. The hostel even provides a towel for free and a personal bin. There was a privacy curtain, but the upper portion is netting. It does lets the A/C air circulate, but you lose a little privacy. Each bed is assigned a tall locker that could easily fit my medium backpack and more. You'll need a padlock though.
There were 4 toilets + 2 extra (for the boys). Some even had a wash basin above the water tank. Strange, but convenient. IIRC, there were 4 shower rooms. Liquid soap and shampoo were provided too. The toilets and showers were alway clean. The staff will even tidy your bed and empty your bin each morning.
The hotel also has a cafe on the ground floor, which is a great place for breakfast/lunch. They serve excellent coffee and lovely Thai/Chinese dishes. I especially love congee.
Location wise, the hostel is next to the MRT and train station. Everything of interest is within easy reach. There are also restaurants and convenience stores nearby.
Overall, I had a fantastic stay. The place is scrupulously clean. The facilities are excellent. The staff are friendly and welcoming. This hostel is a premium hostel that lives up to the tag and next time I'm in Bangkok, I'll not even look at alternatives.