Are the prices really that crazy?

Hi!

Me and a couple of friends are going to Key West mid-april. We are travelling from Sweden, and I've read a lot about the prices being crazy. I was there last summer, and I was wondering whether it has become a lot more expensive since that time? What would you say is an ideal budget per day? How much are lunch/dinner including tips? How much is a beer? We pay about 400 USD/night at a four star hotel, which I would say seems like a pretty fair price (at least compared to Stockholm/Sweden where we live), and about the same as most of Florida/US in my experience? Looking forward to the trip!