Antonio has a nice little flat outside the city centre. The apartment is nice and clean, although not so big. It is located between the Lisbon city centre which can be reached by tram or bus in 15-20 minutes and Belem which takes about 10 minutes by tram or bus. There are cafe's and restaurants also within few minutes of walk of the apartment. Also the hipster'ish Factory LX is only a few minutes of walk away. There is no washer in the flat, but across the street you can get your clothes washed for 2-3 euros.
Antonio is very welcoming and gave me a quick rundown of the area and of the areas to which I said I would like to go. He responds very quickly to messages. All in all I can nothing but recommend to visit Antonios flat if you're visiting Lisbon.