I went back to the first wall of the play house and added a double heart window to it. It was a toss up between a heart and a princess crown opening for the window. The heart won out being the eaiser choice.
A couple years ago I bought a box of sticky velcro dots on clearance. Actually two boxes one of white and a second box of black dots. I have used them on all sorts of things around the house except they can't be sewn on to anything. Sewing machine needle globs up with adhesive immediately and I can't even pull a needle through the adhesive backing. The answer finally came to me if "you can't beat them join them"... Use a stronger adhesive. I tried a sample of felt glue with the velcro dot onto fabric last night it seems to have held up pretty well.