There are a few downsides, and one upside to booking this place.
Upside: location.
Downside:
1. Accuracy of their description - you receive a room in a 6 bedroom apartment. It doesn't mention this anywhere. Then, there are only two bathrooms for an apartment with 6 bedrooms.
2. Cleanliness - lacking. The place is not very clean, to say the least. Bedsheets, bathrooms, the overall feel of the house (which is subjective, I understand, yet many of the guests raised the same concern).
3. Communication - it seems to be a management company that has tons of these places all around Lisbon. It's quite challenging to get response in a timely manner with them. Though, it was very hot in the room so I asked for a fan and received one the same day.
4. Check-in - that was a bit of a weird experience. They have this app you either need to be connected to WiFi, or (I don't remember the other one). With that being said, I managed to check-in as I had a local sim and got the gist of it. There were many others that had quite a challenging time getting in.
There are many areas for improvement and I do hope they'll improve. The location is superb and the place could really be much more pleasant to stay in. It just requires a bit of care.