It’s the uncomfortable bed. I don’t sleep well as it is. I can deal with the rest.

No hot water

Thin walls

Good question.

I'm actually in a cheap hotel now and the walls are definitely too thin

One time I found a giant fluorescent green buttplug (still in package) in a drawer 😱

I think thin walls, poor service is pretty standard in most hotels, uncomfortable bed and no hot water I can live with..... but constant noise from thin walls is a pain.

typically the walls are always thin, the bed is always uncomfortable, the service is always poor.
so it's annoying when i can't take the 30 minute hot shower that I look forward to.

uncomfortable bed. when I travel I leave for a few months so I travel cheap. no hot water is common in poor countries, thin walls suck but usually people are quiet, poor service doesnt bother me much because once theygive me my keys its over, I'm not there looking for a friend, I'm there to rest, which is why the uncomfortable bed can be a real issue.

Drug deals & musicians.

When the shower door scrapes along the floor

My daughter and I (she was 19) stayed at an upscale hotel in New Orleans and [b]there was no hot water.[/b]

We survived.

Thin walls – that's the worst, when I have to listen to the couple in the next room, "bound to win a prize".

Luckily I've never experienced #1 or #3. And the only "bad service" was the maids coming in when I had the Do Not Disturb sign up. I can live with that, lol. The walls, though...

I need my shower

Myrtle Beach

Most there motels have all those and bugs

Let's see...I believe thin walls would do it for me