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.)