Don't believe the reviews - they'll still scam you if they can
Spent many hours trawling the reviews of the countless car rental companies out of Faro Airport. Had almost come to the conclusion that an honest company didn't exist and that we were going to be scammed regardless. Until we came across Drive4Fun via Zest. Reviews were widely positive so we bit the bullet and booked with them.
Turns out you shouldn't believe the reviews.
Have been charged 300 euros to replace a windscreen for a small dent caused by something bouncing off the road onto the windscreen. We didn't notice this happen so presumably it must have been a small stone. The dent is a maximum of 5mm diameter and less than 2mm deep. The local representative clearly saw us coming as there is no way this required a full windscreen replacement - online Portuguese research confirms that the dent in the windscreen was not warranted for a replacement.
Disappointing end to an otherwise great trip.