Once you notice the x marks to close the window, and also notice that when you click somewhere on the map the popup closes, it becomes more manageable. But it still seems confusing to have one popup block so much of the map even when you mouse away from it. I don't know what the solution is. I kind of prefer the way that, for instance, the ua.com hotel site does it: the map indicators are just numbers, and then you can scroll down to the number of the hotel in a list below that.

I also notice that your site says that the Travelodge Chessington Tolworth is right in the middle of Heathrow Airport -- can this be correct? Chessington Tolworth is near Hampton Court, not all the way to Heathrow, isn't it?