Wi-Fi had serious problems, dropping every few minutes. Signal strength was fine; it's more likely they have a bad setup using repeaters which aren't getting a good signal from the source (I work in IT and setup routers).
I brought this issue up to the front desk on my 2nd day: the guy at the desk called the manager, but nothing they could do. At check out the next day, I said I'd appreciate a partial refund for the problems. The person working the desk (either the owner or the owner's brother, based on a prominently display portrait at reception) handled the situation extremely poorly: "This is the first I've heard of it." "I'll have to talk to the manager." (picked up the phone, didn't actually talk to anyone). "How about a bottle of wine?" (I was headed to the airport.) When he finally got to the point of recognizing I wanted an actual refund, and asked me how much, I suggested 20 euros. He became irate, swearing, commenting that "Wi-Fi didn't even exist 10 years ago!" (it did), and finally *throwing* a 10 euro note at me (I had to pick it up off the floor). The Wi-Fi situation was bad, but the way he dealt with this made it so much worse.