For me, my worst accommodation in wich I have stayed since my student days, and I am a person who travel several times per year.
The worst was that the bed base was broken, the mattress sunk and we slept very uncomfortably, in the morning our back hurt.
The shower head could not be placed, when we had a shower, had to hold the shower head with the hand. Also, there was not a bracket in the shower for placing the soaps. We was in a room with own bathroom.
The accommodation was dirty, there were areas in the bathroom that were black, and it´s easy clean this zones with bleach.
Maybe time ago it was a good accommodation, but nowadays lacks maintenance.