Happy's place was overall great. The location is excellent for reaching some of the must see/do/eat attractions and even around the corner from an excellent restaurant, Bar Bik. It's a short walk from the North Station where you can catch a bus to and from other cities, the train or other transit. The Grand Place is also a short walk away.
The place is great for 2 people trying to explore the city. The bathroom is not attached to the unit, but directly accross the hall. It wasn't a problem, but it was something we felt was not pointed out in the description or noticeable from the photos.
The only problem we had was that the unit seems to be located 1 floor up from the street level and there is a casino/bar just below it. As a result we had some very obnoxious and hysterical people screaming at all hours of the night making sleep somewhat hard. This was during the week (Wednesday - Friday) as well which was odd and could mean true weekend nights may be worse. If you need silence to sleep, be prepared to lose some Zs, otherwise it was a good spot.