I'll try to keep this breif with a pros/cons list for the listing.
Pros: Great location, Easy check-in procedure, overall pretty clean and everything was as described.
Cons: I'm not sure if this has consistently been an issue with other guests here or if I visited at an unfortunate time, but the drainage for the entire apartment was an issue. The shower is a walk-in shower that only has about 1-2 inches of potential fill before it flows out onto the bathroom floor. This wouldn't be an issue if the drain worked adequately, but the drain took a very long time to drain a small amount of water. In order to avoid flooding the bathroom floor, we had to take showers by flipping the water on and off every 20 seconds. This was a huge pain and led to some very chilly showers.
The drainage issue was not only with the shower though, the sinks also filled faster than they emptied so if we were planning on doing any cooking and washing dishes, that would have also been a nuisance, but luckily for minor task like brushing our teeth and washing our hands we were not going to overfilled the sinks.
In the defense of the owner, I did not contact them to try and resolve the issue, but only because our stay was so short (2 nights) and we preferred to just work through the issue as i don't think it could have been resolved immediately.
Assuming they resolve their piping issue (likely just need to snake all of the drains) I would recommend this place as it was clean and in a great location in Lisbon.