we had a wonderful 3 day stay at the "Blue Gem" apartment overlooking the Douro River and city of Gaia. accurately described in the AirBnB site, it has all you need for two couples to be comfortable in your Porto stay. the the beds are comfortable with nice linens and pillows, there are plenty of towels and slower soaps.
The kitchen is well equipped for breakfast and convection cook top meals, there is a microwave large refrigerator on freezer.
Very good AC, wifi TV with many channels and Netflix and lighting with a large bathroom and shower.
The apartment is very secure with separate combo electronic locks on the ground floor street entry and 5th floor apartment entry which auto locks if you forget.
Great cross ventilation and wonderful views at night.
You pay for the great location,, well worth it! We'dWe'd stay here again.