Very satisfied.

Following the car rental company’s pickup instructions made it very easy to find, just a 2-minute walk from the train station exit and then down an escalator. Upon arrival, the staff suggested I buy a 'better' insurance policy which would significantly reduce the car deposit. Just refuse if you’re not interested and they won't insist. They also suggested towing insurance, saying it would cost 150 euros per tow without it. I said I didn’t mind and had sufficient funds, after which they politely dropped the matter. There’s a daily mileage limit of 300 km, and they listed where there were scratches on the car body in the contract, but they didn't walk me around the car to check these spots until after I'd signed the contract. So, I recommend that when reviewing the car's condition at the start of the contract, you should call an employee to check the car alongside you. Make sure to photograph any existing damages as soon as you get the car, so you can show these to the staff upon return to speed up the return process. The thoughtful staff also wrote down the name of the parking lot to use for return on Google Maps. Overall, the service was decent, and any additional charges they suggested were transparent and clearly explained, including the differences from the insurance I had purchased. Just evaluate it for yourself. (By the way, parking in Barcelona is quite expensive. If you're only exploring the city, consider renting a scooter instead, which costs around 45 euros per day and eliminates parking hassles.)

I was delivered to the OK pick up office by the shuttle bus and that worked well. However, when I arrived at the office it looked like a refugee camp. There were people everywhere waiting to pick up their cars. OK operate a ticket system and having taken my ticket I had to wait 1 hour and 45 minutes before I was called forward. Once at the desk the process was smooth enough, although the staff member tried to terrify me into buying every conceivable extra insurance. The car had only done 9500km odd but every panel was damaged or marked in some way so I took great care in marking up the sheet of existing damage. Drop off was a breeze and I had no issue re the existing damage. That said, if there is a next time, given the state of the car I would recommend taking a video of the car at pick up, making sure the phone records the GPS and time of the film so as to have some proper evidence in the event of an issue arising later.