In Berlin Germany so not really sure if it counts, but me and my two sisters booked a "suite" in this guy's apartment. there were like 3 other suites, each one could sleep 4 people. we figured no biggee, at worst its a hostel situation and we have one rando in our suite. for the record I did not book this place, and after checking it out told my sisters I would get us a hotel instead, but they insisted.
the suite was just one room, with some walls that stuck into the room about 4 feet at each bed to provide a little privacy. all of the BnB we stayed at all had some similarities with a hostel, so this wasn't too unusual. turns out our rando was the owner, and we were sleeping in his "suite". his bed was the first one by the door, so we had to walk past it to get in/out. most of the place was otherwise pretty normal, except for his/our suite, everything was blacked out, there was one light, exposed incandescent bulb, heavy wooden furniture everywhere in the suite so it wasn't a straight line anywhere. for breakfast he served blood sausage, and some black crackers.
owner was janky as hades too. he told us he wasn't German, didn't sound German, but never told us where he was from, "somewhere else" was the best answer we got. Both English and German were second/third languages. he was like 6'-6" even when walking around with a stoop, no clue how tall he actually was, never saw him stand up right. long blonde hair, wore colored contacts, pale AF. told us he couldn't go outside anymore due to health reasons. didn't have a cell phone, or any tech beyond a radio in his place.
he told us he would wait until we fell asleep before entering the suite. I think it was supposed to make us feel better, but it certainly didn't. my arse was in guardmode and didn't sleep a wink. guy came in an hour after we did, went to his bed, and just stood over it for like 2 or 3 hours, then grabbed a change of clothes and left the suite.
I don't believe in vampires, but at 4am, in a dark room with this guy and my two sisters, I had a full blown plan to improvise a wooden stake and stab this guy in the heart. that day we toured some churches in Berlin, and my sister, who isn't Catholic, used the holy water, and crossed herself that day. "because we have to go back to the apartment, and it doesn't hurt to be careful". my other sister never had any issue with any of it. I told her if that is how she feels, and something happens, and we get separated, I am not going back for her.
I adrenaline crashed so hard once we left Berlin, fell asleep on the train for 4 hours or so. took a cold shower at the train station just to get rid of the adrenaline stench. I never felt unsafe/in danger but man was I on edge.