It was actually Fox Rent A Car, which evidentally is the local affiliate of Europcar. Required a foreign license - US license plus overseas tickets in and out was not enough. Staff said spouse could drive but paperwork at the end said otherwise.

Everything was easy. Very good price. Clear on insurance, which is necessary for those coming from outside the US.

Car not clean enough from inside, asked for delayed service several miles ago

Excellent service

Disappointing that Europcar didn't have an easy way for the car to use Denver's toll roads in a simple "pay as you go" way. I.e Several of Europcar's competitors at Denver airport fit tags to their cars, so that you can use the toll roads and simply pay just for the individual trips you've taken at the end of the rental. Europcar/Advantage don't do this. The advice from the staff was simply "don't use the toll roads". This was rather inconvenient.