Long story short: our mattress was covered with dirty blood stains that could even be seen through the thin sheet. The man at the reception seemed annoyed by our complaint but offered to move us to a different room, whose bed was admittedly better but still with lighter stains. That an hotel welcoming so many visitors forgoes using fitted sheets while we even use them at home (without receiving hundreds of visitors a month but just for the two of us!) is really beyond understanding.
Not to mention the sewer smell in the bathroom, the fact that the bathroom sink was IN the shower and connected by the same tube (even though that's a detail), that the corridor light could be seen through our door and prevented us from sleeping (because badly fixed), the terrible soundproofing that prevented us from sleeping because of the neighbours' noise, the bath products which had gone off for 4 years, the cigarette butts in the stairs...
Hotels.com didn't even try to find us a solution because the blood stains (although they recognized were disgusting and a disgrace) didn't put us enough in danger.
The two ladies at the reception were lovely and did their best to find some solution, but clearly this was beyond their reach and this place has a clear systemic problem of mismanagement! For the owner: maybe focus on the most basic amenities (that is: protective sheets!) before putting flat screen TVs in the rooms and nonsensical digital check-in in order to cut costs and underpay human beings?!