We've ditched one of our cars so the garage is now a bike workshop. It's still a mess but the cupboards and drawers are still emptyish so there's hope to one day get it properly organised. It's heated and quite light and airy thanks to the windows.
Our bedroom is directly underneath. The window is 4m above ground level. There's a big heavy door and a motion activated alarm. Most importantly though, it's in Switzerland where residential crime is <almost> non-existent.
Possibly better than a new bike!