Tiago's place was awesome. It was right across the street from the train station, so it was within walking distance when we arrived. Being situated in downtown also meant that we were able to walk to most tourist attractions. Tiago even supplied us with a list of the best local places to eat and interesting places to visit, which was much appreciated and made it much easier to narrow down all the various things that we wanted to do in our limited time.
The unit is nicely equipped with everything that might be needed and it really helped that the supermarket was close by for the night that we stayed at home to cook. Even though the apartment is on the 6th floor, it was a little noisy for my wife (a very light sleeper), but it wasn't that noisy for me (a medium to heavy sleeper). I suppose the little noise is is the trade-off for being so centrally located to everything that you might want to see.
All in all, it was a great stay, very enjoyable experience. And a nice touch to have a small bottle of Porto waiting for us on arrival.
Muito Obrigado Tiago!