In reply to Alun:
The staff weren't rude, but weren't making an effort to be pleasant when we were up there this summer (camped outside, but had dinner in the hut). Dont expect to be able to use the toilet facilities of the hut if youre camping (my girlfriend asked where the toilet was and was told that we were just in the hut for dinner, nothing else!). The food was fine, and beer was available for 3eur a can from the hut snack bar, cash only. You also need to book online for dinner, in advance. One couple showed up hoping to just pay at the time, and were told that they would have to go back down to the valley to get service to book online!
The camping is very pleasant, with loads of flat space. No one takes notice of the "no tents up before sunset" rule, and the hut guardians dont seem to care either. One of the nicer spots however is unfortunately right beside the toilet boulder.