We stayed just for our final night in Portugal after being abroad for ten days, so basically we just needed a place to sleep and we were not expecting much.
The positive thing of the apartment is his overall location (near from everything you need to see in Lisbon), plus the cat is super friendly if u like animals like we do. We did not use the living room and the kitchen but they were very clean and tidy.
However, the place is very little: small bed, small private bathroom, moving is really difficult if you are two in the room. The other problem was the noise. Outside was very loud until 1 am, which is not so cool if you have a flight next morning. And the apartment is so small that you hear pretty much everything from other rooms. Lastly, we had troubles with the key that opened the main door of the building (as the couple of the other room did).