One thing really bugged me though: I had booked a 2-bed dorm room in advance, but when I arrived, the lady at the reception said "so you booked a 4-bed dorm room."
Me: no, 2-bed.
Her: We don't have any.
Me: Then why do you advertise them?
Her: We have some renovations going on.
Me: I don't find it nice to treat customers like this. I especially chose this place as it offers 2-bed rooms.
Her: Sorry, only 4-bed rooms now.
Me: No way.
Her: OK, I'll give you a discount for the 4-bed.
Me: I don't want a discount, but the room I booked.
Her: OK, I'll put you in a 2-bed room and someone else in the 4-bed room.
Well, this is unacceptable, luring people into your place with something you can't accomodate, then try to fool your guest and in the end it is possible after some discussion... As it worked in the end and my room was fine, I might give them another chance.