Goncalo and Sandra's place was perfect for our short term stay in Lisbon.
It is possibly in one of the best locations you can get, within walking distance (even with the hills!) of all the main districts of Lisbon and was really easy for getting to and from the airport.
While the apartment is quiet small, it is very well decorated and fitted out, with everything we needed for a very comfotable stay.
We would have no issues in recommending their place.