I stayed for a month in Delfim's place. I would say the biggest advantages of the place is the location, amenities, communication with the host and value that you are getting for your money.
If you are coming for a week or a weekend it is the good place to stay.
However, if you come to work and live in Lisbon be aware of lack of light in the appartment in the long term.
I suggest it for small trips with friends when you are not planning to spent hours inside the house.
The host also really responsive and will attend all your needs in a timely matter.