As noted yesterday, I recently returned to using the exercise bike, which shares a little too much space with the downstairs round cat condo. To keep my pedaling feet from being cat toys, I booted the cat condo into the front hall next to the newel post.
Not surprisingly, the boys found this to be a great place for it, as they love hanging out in high traffic areas. This gives them a comfy little watchtower where they can monitor traffic, see the living room, and hear the upstairs hall. It's also probably slightly warmer there than the far end of the living room.
The surprising thing is, the watchtower in not the way of the human traffic. (Yet.) So it gets to live there for a while.