Ain't really got much of a clue about the camping, though by the looks of it it's sound.
The Zeeburg area is one of my favourite parts of the town really. You're surrounded by water and nature, so when the weather is bright you'll enjoy it. It's easy going into town too, the tram stops about five minutes from the camping. So it's pretty much up to you what you do. If you plan on going out though, you won't find much joy in this particular part of the town, you'll have to get into town. Maybe it'd be clever to rent a bike for getting back to the camping because nightbuses can be a bit of a pain and taxi drivers are generally robbing bastards.
And, in all honesty, you won't get any cheaper accomodation. I'd say you've got a decent spec with that one.