We had a mouse die under our waterbed many years ago....no way to get to it because it had a pedestal with six drawers.....had to live with it until it quit - found a skeleton many years later when we finally removed waterbed - phew !!!
Also used to get them in kitchen during winter (lived in country with woods behind) / one caught in trap and drug trap under base of kitchen cabinet - lived with smell again but learned to tie string to trap to pull it back !!!
Hope you get a quick solution - those little buggers reek 🐭