If you don't mind a very busy and noisy road, this place is nice and well taken care of. The check-in was great (we got some cool walking tour ideas from Francisco). The apartment was clean, nicely decorated and with everything we needed.
Communication was excellent before, during and after our stay. 5 stars for the hosts.
Close to downtown Porto but far enough so that we had a feel for a more local neighborhood, which was nice.
The only negative thing I have to say about this apartment is the noise. Thin walls, loud neighbors, poor quality double-glazing and a very busy road (even at night), plus a christian church playing music most nights of the week made it difficult to sleep, much less work from home.
So if you are not hyper-sensitive to sounds like me, this apartment will make for a very pleasant stay.