No real horror stories, mostly excellent to be honest.
The one biggest problem was renting an apartment in Gdansk, on the top floor, no stairs. Got up there, got the keys from a security box next to the door, and found a whole bunch of keys, and a door with about six different locks on it. We couldn’t open it. Me and Mrs HYG were both there for 20 minutes trying every possible combination of turns, and we couldn’t make it budge. Eventually gave up and decided to try and get in touch with the renter, who lived in Thailand of all places, and wouldn’t answer our international phone calls. Went to a coffee shop and emailed them and they got in touch, said it was easy and they didn’t know what we were fussed about. Went back, had another crack, eventually solved it, don’t know how. Were pretty cautious about coming and going after that, only bothered with one of the locks. Was crazy.
Also got electrocuted on the dishwasher.