We've stayed at Hotel Old Quarter 6 times in 20 months and have never had a problem with it. You have to take into account it's pretty basic, but we've never had a problem with cleanliness. You'll often be able to get into your room earlier than normal check-in, dependent on how busy they are.
It's in a fantastic location, with many rooms overlooking the canal basin where the sightseeing boats are moored and Damrak over from that. Voyagers is only a 5 minute walk around the corner and we've always found the staff very friendly and up for a giggle. Shame, wi-fi is only available in the main downstairs bar/restaurant (where the food is pretty good), but you can just about get a connection in the lower floor rooms however.
Funnily enough, it was reading this thread yesterday that prompted me to book a trip for the end of July. Stuart's recommendation for Hotel Nadia with the balcony rooms seemed interesting so we're staying there this time. Get stoned in a different place, as the Happy Mondays once sang
Seem to remember Stuart wrote a trip report involving his stay at Nadia, so I'm off to find and have another read of that.
Peace