I usually use the kitchen island. It's the right height for me and big enough for my large 36" cutting mat to just fit with a little room left over.
I'm not sure if I'll change that when I move upstairs to my new room. One thing I am doing up there is covering an old, heavy metal and wood table with an old blanket then a sheet and using it as a new ironing board. No more struggling with my ironing board when it comes to bigger pieces. I may see if there is some way that I can put a board on top of it in order to use it as a cutting surface also. Still working on exactly how the room will end up.