Originally Posted by totti

Anyway I wouldn't call it a good rate. Airport fee is not that expensive but it's the insurance that counts. So you should probably get yourself a CC that covers all insurances.

I wouldn't wait another 2 days but give Sixt a call or write an email. If you use email, don't expect an answer. They just correct everything (most opf the times pretty soon) but they almost never reply, at least this is my experience and I rent a lot with them.

I hope everything works fine for you.
Cheers
totti