I've rented luxury-rated cars in Europe before without an issue.
But in May when we arrived in Rome to collect our confirmed car from Avis the lady at the desk wouldn't accept my two credit cards (which is a requirement for luxury cars). The second card had my husband's surname and even though we're married and the booking had both of us as drivers - she wanted to see my name only. I didn't change my name when we married - it is the 21st century.
My husband has two credit cards in his name - and while she would accept these - she said she'd need to do a totally new booking at TODAY's rate - DOUBLE the confirmed booked rate. Even though my husband's name was included on the original booking.
She kept telling us she was offering us a "good deal". What?!?!?
We ended up driving away with a more affordable, but disappointing Ford Echo.
Later when I checked our English version of the contract, she had also added full comprehensive insurance, which I specifically said we didn't need (covered already by travel insurance).
Never again Avis.