The flat is located in a nice area, where Lisboetas do still live, with the wonderful Jardim da Strela around the corner, but (thanks God) yet a bit off the typical crowded tourist routes. That I consider a big advantage because you can still see the real Lisbon neighbourhoods. There are plenty dining opportunities around specially in "Campo do Ourique". I have spend almost 3 months there, for working reasons, and found the area completely enjoyable.
The flat is modernly appointed, with a kitchen and new appliances. The bathroom is also very modern, and very clean. It has lots of light, which makes it very nice to wake up in the morning, also with the sounds of birds in the trees of the backyard. There is also a nice cat colony :)
Tram 28 takes you to the Chiado area, in case you want to join the marabunta of tourist now and then. There are also other buses if you prefer going to the very center without feeling like a sardine in a can. (Tram 28 has become a tourist attraction on its own).
Sergio is a warm and wonderful host, very concerned with the status of your stay.
I will be back ;)