Technically, nothing is wrong with this hostel. Shower is hot, water seems okay, wifi works quite well for Koh Tao and the bed itself was clean. However, staff seemed a tiny bit unfriendly and strict about procedures (not even a quick shower after checkout, 500 Baht extra); also, someone has taken 2 shirts and my flip flops from the clothes line outside (my fault, but still). Other than that, it's super cheap and okay. Check for bungalows by the beach as well, same price but you are alone.
top location in a lively area of bkk, staff is super friendly and helps you finding new friends for your stay. awesome!
My friend Tobi and I stayed 2 nights there: Rooms and facilities are clean, the coffee is strong, the people are great. Staying at Ai 4 Canti is by far the best thing you can do in Palermo. Pepe and Veronica are just awesome people and they connected us with with the rest of the travelers at the hostel. We were partying every night, they showed us places to go, etc. The private rooms are 5min walking distance from the main "hub" in a nicely renovated apartment. Just perfect!