The flat is in a great location in a really authentic neighbourhood. The interior is modern, place is clean and really light. The check in is really convenient as you can let yourself in with a code, so no fuss at all! There's a street parking close to the apartment (2min walk) which wasn't expensive at all and is free to use overnight.
We only stayed there for a coupe of nights, but we had a great experience and would definitely stay again once back in Lisbon.
The only downside for us (if comparing it to the other places we stayed at before) is that there was no shampoo, shower gel, coffee etc for you to use. So if you're coming just for a short break like we did, make sure you bring/buy these things for yourself. Other than that, really great experience!