Apart from the car pickup, everything else was acceptable.

This was an extremely poor car rental experience, full of various traps. It's not my first time renting a car abroad, but I've never seen such shameless behavior from a rental company. They insisted on having two credit cards, and since I forgot to bring the second one, they downgraded my car, which would have been acceptable. However, they charged a 350 euros car swap tax and said I had to buy a 400 euros full insurance unless I paid the tax. This is coercive insurance selling. And it didn't end there. When returning the car, they told me the 400 euros was before tax, and there was an additional 20% tax. Rentalcars.com, please evaluate if this is reasonable process and fair charge. To all future customers, don't be fooled by international brands. If Hertz continues like this, they will eventually be overtaken by competitors. Rentalcars.com also has some responsibility in the choice of suppliers. I suggest terminating cooperation with Hertz in Madrid to ensure customer interests. If a middleman loses customer trust, where is the competitiveness? Additionally, I reserved a specific model, but a month before the trip, they notified me unilaterally that they could only provide a similar class. After complaints, they agreed to provide the specific model. I strongly doubt they even had my reserved model available that day.

Both pickup and return went smoothly, but two weeks after returning the car, I noticed an inexplicable charge of 60 euros for fuel and service fees. I immediately sent the return report and fuel receipt to the rental company, but it's been over ten days and still no resolution. Not sure if this is personal deceit by the staff or an intentional act by the rental company.

Pickup and drop-off were very convenient, but what's this 21% about? Are the listed prices not including tax? But the tax is only 10%, right?

Simple rental procedures, friendly and attentive front desk service, easy and convenient car return.