i travelled with 2 of my best friends (all girls) and we originally didn't have anywhere to stay on Phi Phi. The plan was to just find somewhere when we got there.. however at Bangkok Don Muang airport we were approached by a lady who worked on the Travel Agents desk there and we ended up booking the Phi Phi Hotel for 5 nights through her.
The hotel ended up costing us about £10 per night each which was absolutely fine for us! We had 2 single beds and a comfy fold out bed in our room, and still enough room to move about and dump our massive backpacks.
Bathroom was lovely, really clean, shower absolutely AWESOME(we stayed in the Bangkok Marriot Resort & Spa later in our stay and the shower was AWFUL!), fantastic water pressure & unlimited hot water too which is quite unheard of for £10 a night to be honest.
The only problem we did have was a bit of an odd smell at one end of our floor sometimes, but I think this is because of the bathroom renovations they've been doing. To be honest it didn't really bother us, and the staff were so lovely I'm sure they would have moved us had we asked.
There was 24 hour security at the hotel too, which we didn't really feel was neccessary, but was reassuring all the same. The people staying in the hotel with us seemed to be a mix too, of young people like us, couples, families and groups of sort of 6 and 7. But we never had any trouble with noise at night or anything.
Overall we had a fantastic stay at the Phi Phi hotel, it is literally smack bang in the part of the island where the two bays almost touch so you can get to either the port or the main beach super easily! I would definitely reccomend booking it at Don Muang airport if you're happy to leave it a bit last minute, they organised all our airport transfers too and our ferry to Phi Phi and back, which was great.
Any questions just drop me an email..but most importantly enjoy your visit to Phi Phi if you're planning one!!!