I have to admit I was very disappointed with the property. I don't usually write bad reviews and I feel I should clarify that the host was very helpful and replied fast however I felt like the property was highly missold.
It is sold as a 2-4 bed place, however it is strictly a 2 person property. From the photos it gave the impression that there were different flats with different layouts - I wrongfully assumed that the picture where it is a single studio was a 2 person accommodation. I went ahead and booked it for 3 people only to find there was no privacy at all and our third party had to sleep on the couch basically by our feet. (We were a couple and a friend.)
The pictures of the outside space made it look like a cute little private courtyard that you'd maybe share with the "neighbours" but it is actually just the street outside the flat. They do provide outside seating but you have to set it up yourself and take it back in when you're done, which isn't particularly easy or nice as it adds extra work and stress (e.g. you don't want to accidentally scratch the materials or glass when moving the furniture in and out - or forget to take it inside only to come back and find it stolen.)
There was also the issue of the lack of window - the only way to air out the premise is by opening the main door or a side door, both of which open out straight into the street. It was very hot but as we were going to bed we didn't want to risk inviting any unwanted visitors by leaving the door open.
The host recommended a €10/ 24 hour parking however this was incorrect (the price has clearly increased a lot).
I also found that the rules were a little bit excessive - the threat of a minimum €500 fine being a bit too high for misbehaviour, including loud noise considering it's based in central Lisbon where night live thrives (and isn't too quiet).
All in all, it was a disappointing experience. I am Portuguese and have stayed in different properties around Lisbon before - including downtown - but haven't paid such a high price for a small/missold property.
Please note that the host's communication was on point, as was the cleanliness and check in - I just feel like the photos don't represent the property and that it should absolutely NOT be sold as more than a 2 bed.