I have my machine up against a large window. But then again I have a hard time FMQ no matter where I am!
I'm currently FMQ q full size quilt on my 15-91 in a small cabinet. It's tricky keeping the enter thing on the cabinet to prevent drag, but so far it's working. My next quilt I'll be FMQ is a king size so that will be the big test if I need to rearrange my sewing corner.