Arrived half an hour early and the staff were very impatient. Basically, they just wanted to charge more for an upgrade.

I paid an extra 30 euros for an upgrade and the car was excellent and good value for money

You did very well!

Car was fine. My own fault, but the fuel policy was not clear enough. What started out as a very good value rental soon gets eroded with additional and unexpected fuel refill charges.

The mobile app can be difficult to navigate. Spent ages looking for a way to change currency. Would be good to default back to home currency instead of last used. Also would be good if fuel policy other than full to full was highlighted more prominently. Fuel policies can have a significant impact on overall cost.

The instructions said the office was opposite check in desks 165-170, there are no offices there. Got sent here there and everywhere by staff at Madrid airport and eventually found the office on a different floor! Mentioned this to the man on the counter and he just shrugged and said they knew it was wrong! He was very rude, in a bad mood, unhelpful, not at all friendly, very pushy trying to sell me insurance I already had and told me they were blocking one amount from my card and then blocked more. He also lied to me, telling me the amount would be blocked for 30 days, trying again to get me to sign for the insurance. When I returned the car they confirmed the balance would be unblocked within 2-3 days!

Very quick and easy.

The car was just what was needed for the couple of days I was in Las Palmas. The whole experience was good, except for the fact that the insurance cost (80 EUR or a 900 EUR deposit) and the fuel deposit (another 80 EUR) was hidden until I arrived to pick the car up. Not the most unreasonable pricing, but disliked the underhanded way it seemed to be hidden until I had little choice but to pay it. Would have been much happy had it been included in the original cost when booking online.