I had the pleasure of staying at Tiago's place for an extended period of time due to an extended business trip, which required accommodation for a few months and can honestly say, staying at Tiago's place really made the trip for me.
Tiago is a hospitable and courteous host and any small problems were addressed immediately without any quibbles whatsoever. The place speaks for itself, just look at the pictures.
Whatever your reason for staying, the place is perfectly located in the up-market area of Foz, which is but a short bus or tram ride away from town or via a very pleasant walk, which should take about an hour along the Douro river if you're feeling energetic (plenty of coffee shops en route). Locally though, the promenade along the coast is just a couple of hundred meters away and is a fantastic place to stretch the legs and take a stroll with plenty of restaurants along the front to stop off at and take in the view as many of the Portuguese love to do. There are plenty of fantastic restaurants locally and some of the best in Porto are within a five minute walk of the apartment. Indeed many work colleagues as well as locals would leave the relatively touristy area of Porto and join me in Foz as the restaurants were better. You won't be disappointed.
In my opinion, Tiago's place allows you to dip into the touristy aspects of Porto but escape to the convenience and charm of Foz with everything it has to offer. Enjoy.