The appartment is very spacious, clean and tastefully furnished with some cute details. We were positivelly suprised over all the gadgets and kitchen equipment. Everythink seems to be new and works properly. The appartment also has a small balcony.
Our hosts were very nice, communicative and helpfull with tips about places worth visiting in Lisbon.
The only small disadvantage is distance from the city centre. It is a bit far to walk there (takes app. 30-40 minutes) so you have to take the metro or uber (the cheapest way). Both get you to the center in 5-10 minutes.
I highly recommend this appartment! Just remember, that you can get so comfy in it, it's gonna be hard to leave! :)