I used to let my hamster free-roam in a blocked-off area (a hallway) where I could sit on the floor with her. I agree with the others that an open space can be a bit scary for a ham, and what I did was make lots of tunnels out of cardboard (what I used was empty cartons from ten-packs of canned soda or seltzer that I cut and made into long triangular tunnels that don’t roll around) and she loved them. She would run from one to the next to the next to the next.... you get the idea. I think having things for your ham to explore is a great idea for free-roam space. Good luck!
