Manuel's apartment is very well located: right next to a metro station and at walking distance to downtown major attractions.
The apartment itself was spotless and had everything needed for a short stay. One drawback was that the apartment got extremely hot during the day (last floor, right under the roof, south facing windows, no air conditioning).
Manuel was a very attentive and welcoming host. He gave us plenty of tips on what to do and where to go in Porto. This turned out to be very helpful.