We were about to stay 2 nights there in order to visit Mt St Michel, but fortunately we decided to spend only 1. When I woke up the next morning I was bitten all over by bedbugs. After showing the bits in my arms, back and belly and the traces on the bed (typical bedbug traces) I told the personnel that I wasn't going to pay and they overreacted. The manager wasn't available by any means. After arguing for a while I offered the receptionist to write down a letter explaining the reason why I wasn't going to pay to the manager and she accepted.
My impression was they knew beforehand about the issue and wasn't willing to do anything about it.
The same happened to a friend of mine in Barcelona a couple of months ago and it seems to be a plague all over Europe that hotel managers seems to be trying to hide.
My personal recommendation: Avoid cheap hotels like this one (bedbugs itches like hell!!!).