I would strongly advise anybody to avoid using Algarve Car Booking (or partner AV Discovery) when booking car hire from Faro Airport.
Firstly, they appear to have a scam going on at drop off for the vehicle. The hire desk claims that nobody is available and requests you to leave the car open and keys in the ignition, as most people are in a hurry or are juggling suitcases or a family at this point it is very convenient to follow this without due diligence so you can get on with checking in at the airport. However, when I returned home I had received an email stating that the keys were missing and the car was locked with a surcharge to my credit card of €250.00 for replacement keys!
The company will not reason with you and tell you that you should have rang the ‘helpline’ if nobody was available to collect the car. I have since noted other similar comments on the forum for this company where they were advised to leave the keys in the car as nobody was available and received credit card charges for mystery damages.
The company advertises through the airport website at very reasonable rates, a new fleet and a desk in the arrivals hall making you feel that you have a great deal. But the fleet is old (my car was an old shape Fiat Seat circa 2006) and the hire desk is outside the airport in car park 4.
Unfortunately, what you pay is usually what you get so do not use this company unless you want to risk getting caught out as I did.