Wow it is definitely priced "premium". Didn't have the same issues as you though. TIL about the Sebo brand.

If a canister vacuum is not going to fit in you apartment, I think you'll have to find an intermediary solution, not something BIFL.. unless you plan to live in a small studio for the long term. I stuck my vacuum in my clothing closet while I lived in that studio.

Perhaps just get something cheap and fits the form-factor you are looking for? I doubt youll get the same cleaning power as a canister vacuum in any other form factor. When you have more space then you can reuse your Sebo or look into Miele if the Sebo's features/design are annoying you.