Me and my friend stayed here for 5 nights. I checked almost every reviews of accommodations in Koh Phi Phi and chose Dee Dee as it seemed to have the best value for the price according to the reviews. I don't know how much I should expect on Koh Phi Phi, but this place wasn't that good.
First of all, if you're coming to Koh Phi Phi for parties and staying for one or two nights, this would be the best place, yes. If not, you should avoid any hostels on this side of the island. There are beach bars and the party goes on till some time around 3 or 4 in the morning and your room will also be banging till then(although Dee Dee was relatively further away from the bars).
The room seemed carefully cleaned, but it was worn out. Also, tiny ants were crawling everywhere in the room including beds. I know I stayed during monsoon, but the room was way too damp even with the AC on. I don't know all other rooms in Dee Dee are the same, but the room we stayed in was small with low ceiling and minimum ventilation, so humidity just stays there. Whenever I slept with my hair wet after a shower(no hairdryer in the room) at night, I woke up with my hair still wet, which I've never experienced before. Believe me, the AC didn't do anything to the humidity, we were damp and freezing if we kept it on. Bathroom we had smelled like sewage the whole time, which wasn't pleasant. And the water was rather salty.
Staffs were friendly and helpful.
I somehow coped with the room so I didn't ask for another room or move to another hotel, but I cannot say it was a pleasant or satisfactory stay.