Tiagos place is 5min uphill from a metrostation that is directly connected to the airport. I walked everywhere from the home, to the city center it takes 15min-20min downhill, to the river maybe 10 more. If you walked back home everything takes about 10min longer because you have to walk up the hill, and sometimes it's very steep.
There is a supermarket right around the corner and next to it a great bakery, you can get loads of different breads and also great pastries. (Sao Jorge is the name)
The place is big enough for 2 people. The bedroom is upstairs and there is enough space for luggage.
I very much liked the flat, but as I traveled there in February it was very cold in the apartment, because there is no installed heating. There is a little heater (like a fan) but I takes a long time heating up the room and it doesn't stay warm. So if you travel there in winter or early spring, bring warm sleeping clothes and woolsocks.
But all in all I can really recommend the place, it's nearby the city center but not right in the middle, so though it's right next to a bigger street, it's not loud at night. At least I did not think so.
Enjoy
Franzi