My girlfriend and I stayed for 5 nights at Isabel and Anastácios apartment in the beginning of October. We were traveling with our 6 months old baby boy, and the place was perfect for us. It's in a quiet neighborhood a little outside the city center. However it's still very easy going to the center using the metro just 5 minutes away.
The apartment is spacious, clean and the terrace is really nice. Since we were traveling with a baby, we didn't go out for dinner at night. But the kitchen in the apartment is well equipped and made it possible to make some nice dinners. There are supermarkets, bakeries, butchers etc. close by with good quality products.
If you are traveling with small kids, be aware that you have to climb some stairs with your baby stroller up and down from the apartment, going to the metro and in Lissabon in general. Consider it a workout making room for an extra dessert :)
The main bed in the apartment is a twin bed. But each bed is fairly big and comfortable. Besides that there's a sofa bed in the living room. However the "bedroom" and living room are pretty much combined. This could probably be annoying to parents traveling with older kids or two couples traveling together. Some curtains to separate the bedroom just a little bit from the living room area, would probably be nice if you are more than just a couple traveling.
There's a flat screen TV in the living room with satellite channels and the WiFi in the apartment works perfectly. If you are concerned about safety issues, there's also installed a fire extinguisher, fire blanket and fire alarm in the apartment.
Isabel and Anastácio are great hosts giving us a nice welcome at our arrival. They are living about 20 minutes from the apartment. They respect your privacy, but are also helpful if there are any issues. We had a small problem with some ants crawling in from the terrace (probably because it rained a lot some of the days, making the ants trying to escape and find a dry place for a nest) I wrote Anastácio and he was there immediately with some insect spray that took care of the problem.
Last but not least, they had provided for us a baby bed, a baby bath tub and a baby towel. This just proves that they are hosts who wants you to have the best stay as possible.
A highly recommendable airbnb experience!