I have a bathroom obvs but that might be a little small.

If you have room for a 12"x12" cardboard box in a closet bottom or corner or can make space in a drawer you line with tinfoil and bits of tape and cover with an old soft sweatshirt? You can foster. I've had old quilts in a bathtub for a mom and kits. Ask for a mom & kittens for a first time foster.