MidWest Homes for Pets 30-Inch Exercise Pen, for Indoor and Outdoor Use, 16 Sq Feet of Play, Single Door Folding Dog Pen, with Large Door Opening & Secure Latch, Easy to Set Up, Foldable Dog Playpen

If the bun is causing havoc in your apartment, I'd strongly suggest getting it an x-pen for now. Amazon has some available right now with Prime Day: https://a.co/d/088PWzv3 Also a washable pet rug would help keep the area clean and easy to clean up their messes, plus keeps your furniture safe. I'd be happy to buy it for you if it helps alleviate some stress of the situation, just let me know where to send it. It absolutely sucks saving an animal but then being "stuck" with situation because you're a good person with no one to help.