I believe Cosmos hotel is one of the worst ones in Europe ;)
Rooms are incredibly dirty, if you want to use hot water, you need to wait for 15 minutes with the tap on. Late at night my wife met a fat cockroach in the toilet.
The owner seems to have never changed furniture since early 60's - in a drawer we found 'ancient' inscription made in 1962.
You can always count on very poor service in Cosmos, all the staff seems to hate guests.