As requested by numerous users, removing floors has been implemented. This should save you some cash in case you've had too much fun while building.

how do i get more money

Bring in guests. Give a link to your hotel to your friends, paste a link (http://www.yerhotel.com/get-visitors) on your blog. Visit other people's hotels and drop them a comment...

Will I get my money back if I remove a floor? Or it will just dissappear like the floor?

I didn't get money back when I removed a floor. :/