I love this old motor home. Wouldn't it be great if you can go anywhere in the world and stay here as long as you want?
In case, you want to stay in Prague, you may find this list of Prague camps helpful. Personally I would choose Intercamp Kotva because is has almost that out of city feel. Well, there's a highway on the other side of the river - yes it's at the Vltava river. And you're really close to center, just about 15 minutes by tram (or partly by bus as the tram lines are in repair right now). Here is the tram you would go with, this peaceful bay is just around and you'll see this on your walk towards the Prague center.