Very good.

There were staff guiding us at Lisbon Airport, and we only waited for about 10 minutes.

When picking up the car, I asked two people about two pieces of luggage. They said the car I booked was suitable for city driving, but if going to a farther city like Porto, it would be better to switch to a larger car, which would cost an additional 25 euros per day. Nevertheless, I chose to keep the original car. The car I received had 20806 kilometers on the odometer and was relatively new. Although it was a compact car, its height made the seating feel spacious, and after folding the rear seats, there was ample room for two pieces of luggage. The car handled very well, but the air conditioning was not very effective.

The service was excellent, and the staff spoke fluent English.

Like: The car was brand new and excellent. OPEL ASTRA STATION WAGON, so if you have 3 big suitcases and 3 small suitcases it shall be okay.
Dislike: the device for tall road fell down on the floor for one day and I don't know if Europcar shall charge me for this day when I drove the car on the highway. ( I paid for the device the whole period)