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Congrats of course with that, but your post is a little bit out themed.
I had an almost similar situation but it had ended not as well as yours
I traveled to Europe this winter and it was awesome. I'll share with you one photo. My internet is slow, so I can't share more.
maybe you pay so much because it is the new year eve and post new year. When I was Couchsurfing I found a family that gave me their car for 1 week...
I used economycarrentals too, and everything was fine, no extra charges or any extra fees