Started out well, but turned into a total nightmare.
The apartment was as advertised and we had no problem checking in, etc. We stayed two nights, and the first night we didn't hear much from the apartment upstairs.
But on the second night we got back from sightseeing and dinner about 11pm and there was a young guy, who looked like a teenager, standing in the communal doorway. He was on the phone giving directions to the address. This did not bode well. And soon enough more people arrived at the apartment above ours and started playing incredibly loud bass-heavy music.
As the evening went on, more and more young people arrived - there must have been at least 20 people crammed into a tiny studio flat - and it descended into a full-on party.
The noise went up to ridiculous levels: there was shouting, whooping, screaming, loud singing, cheering, thumps, bangs, crashes, foot stomping, arguing. The music was so loud the bass lines were shaking the walls. There were people coming and going all night, slamming the front door and shouting and hollering in the corridor. It was actually quite intimidating.
As the disruption got worse and worse, we contacted the host, who replied saying she would see what she could do about it. But it turned out she couldn't do anything, and didn't respond to any of our further messages.
We then tried calling the noise team at the local council, who can help deal with these kinds of antisocial incidents. But they did not answer or reply to our phone message. So we just had to sit it out. The party eventually ended around 5:30 am, which meant a horrible sleepless night for us.
I wasn't able to ascertain if the party apartment above ours is owned by the same host, but I'm pretty certain it's an Airbnb. Airbnb was supposed to be cracking down on parties by automatically preventing customers under the age of 25 reserving entire homes if they have fewer than three positive reviews. But the young people throwing this party were much younger than that, so that policy is clearly not working, or being implemented.
Regardless, our trip was totally ruined by this truly horrendous ordeal.