Bait and switch. We paid for a 2 bedroom apartment. The day before I got a message saying to meet at a different location. I didn't think much of it as they never mentioned any issues, I just thought we would head to the apartment from there. When we arrived we were told the apartment was flooded and they had a new spot for us. I was traveling with another friend and we were supposed to each have our own bedroom. Instead, they take us to a small hotel room with a one bed in it. The host then acted perplexed that this wouldn't work. He insisted he thought I was traveling with my girlfriend, which I definitely never said, particularly because I am married and my wife doesn't let me keep a girlfriend :)
They never offered us a refund. We ended up having to pay another 110 euros a night for another bedroom in the hotel. Meaning, we paid twice as much to have what we had signed up for 6 months ago.
The hotel was fine, but right above a bar that stayed open till 4 am...so it was extremely loud. It all felt like the classic bait and switch. Maybe there really was a flood? Maybe they double booked? Regardless of what happened, I ended up paying double.