We had a great time in Porto. The apartment is located right in front of D Line Metro Station "Marques". I suggest you purchase a 24 hour tourist metro pass for 7 Euros. This pass works on Metro, Busses and Trams and will make it really easy for you to move around Porto otherwise each Uber ride is going to cost you 7-10 USD on average.
The apartment itself is very clean, well equipped and the hosts are very accommodating. We had an early 3:00 a.m. flight and the hosts arranged at Taxi that showed up right on time.
Everything is perfect about the apartment. You will enjoy your stay at this property.