I had almost the same experience when I went on vacation touring Europe. I checked into a hotel that received good reviews online without seeing the room first. What a mistake. There was a rubber sheet over the mattress to cover some nasty stains but the rubber cover had dog paw prints on it. The shower had what looked like a mushroom growing on the side and mould everywhere. The bathroom was shared with several other guests, nasty looking and down the hallway. The crowing piece was their artwork wall mural which was a picture of a giant ass crack... not sure where they were going with that idea.

Yeah ...I demanded a refund, which after a bit of argument they begrudgingly did then went to an Ebis Hotel.

Moral of the story... always ask to see the room first if you're not sure. Any reputable place will be happy to let you in first and you should have the right to see what you're buying first.