Unfortunately I would not stay at this property again and would not recommend it to others. One major reason is the only way to get into the apartment is via a specific mobile app you have to download and they send you a digital "key" by email. This didn't work well for us as I recently had my phone stolen, so we only had one key between the two of us. It was not possible to get a physical key when requested.
We had an incident where the digital key got deactivated, and we requested help via Airbnb messaging, Whatsapp and the mobile app. It took them almost the entire day for them to reply back and issue us another key, during which we could not leave the apartment (or we'd have no way of getting back in). You'd better hope your phone doesn't die on you while you're out, or you'll be locked out and have no way of contacting support.
In addition, I found the support from the host to be quite lacking. We had some issues with a persistent bad smell and a bug infestation that occurred during our stay and the host provided no assistance beyond replying that sulfur is normal in Lisbon (but it's never that bad) and to close the windows.
For the apartment itself, the bed is exceptionally uncomfortable as the pillows are rock solid and the mattress is hard and crinkly (some kind of lining they put under the sheets?). The space is quite small for the living/kitchen area, and the neighborhood isn't really close walking distance to many of the interesting spots in Lisbon (so we relied quite heavily on cabs). On the positive side it does receive a good amount of natural light and the shower pressure was good.
We've stayed at many other Airbnbs in Lisbon, and you can definitely find places that are nicer, more spacious, and better value.