Upvote:2
I rented a car from Atesa (I think they have a contract with Enterprise) in Bilbao, drove it for three days, and returned it to their garage in Barcelona. As long as you have no damage to the car when you return and the appropriate amount of gas needed, you should be fine. Make sure that you read the terms of your rental to make sure of what condition you must return your car in, because they check every part of the car when you return it. They will also give you a folder when they give you your car, make sure you have that and all paperwork inside when you return it.