Joao and his wife were great hosts, very available and on time at the arrival and departure.
They also allowed us to leave our luggage in the apartment the morning of our last day so that we could pick them up next door later in the day thanks to Joao's wife.
The apartment is withing walking distance from the bus/subway/railway station (to Sintra)
It is conveniently located near the Avenida de Liberdade where the Aerobus has stops from/to the airport.
A couple of bars are down the street too where you have a cheap and good breakfast.
Wifi is available which is a nice addition :)

The only problem with the apartment/building is the non-existent isolation : you can easily hear footsteps above and the main door slamming when residents come and go (the apartment is on ground floor)
Nothing that prevents from a good night of sleep though :)
And condisering the price and time we spent in the apartment, you can definitely live with that tiny drawback.
We haven't used the kitchen because we ate outside.
Nice overall experience !