The size is decent by all means, but the tray isn't very stable. Also, the tray is too low keep the guinea pig feces in, and not out on the floor- as it is indeed an on floor cage, but still. The corners of the tray don't really connect to the cage and it spills urine out onto the floor that I personally have to clean every time they urinate in any of those corners. As I said, the 6×2 size is a decent size and lots of running room, and plenty of room for their toys and etc. However though, the b...