Let me first start with the positive: the location. Your are in the heart of Alfama and look directly at an adorable viewpoint. And the view from the studio is amazing! All the tourists come to Alfama to see it - you live right there. The tram 28 is just a short walk away. Furthermore, the security of the building seems good and I felt save. The communication with the owner/company was ok and his company provided tipps and recommendations (you need to know that you are renting from a company, not a private person; when you leave they ask you to rent directly from them and not via Airbnb).
Now the negative: I read in the reviews that the studio is supposed to be small, and I thought: Hey, come on, how small can it be?! Let me tell you, it’s tiny! It‘s between 12 and 15 square meters - including bath and kitchen (in the description it said around 15 m2). There was space for my bigger suitcase but not for a second one. If you travel with two persons and have more than two catty-on trolleys it’s going to be difficult.... There is no wardrobe, just some hangers. Specially the bathroom gave me a hard time: It’s impossible to sit on the toilet like you normally do, because 15 centimeters (!!!) in front of the toilet is already a glas wall to separate the shower. If you want to use the sink, you step into the bathroom and into the shower (or somehow in that 15 centimeters between toilet and glass wall), close the bathroom door and there is tinniest sink I have ever seen. Of course you can use the sink in the little kitchen but behind the bathroom door is the only mirror of the studio...
Now the bed: The mattress is a huge square made out of saggy foam. I didn’t felt comfortable sleeping there. Than, behind the bed is a window facing the street and a streetlight is just outside the window. The window has a roller blind but unfortunately it‘s white and a bit transparent. That means that the light from the street shines through all night. To be able to sleep in the dark - which I do unfortunately - I covered the window with my towel in addition. Unfortunately they gave me just one set of towels (they told me I had already booked). So it was a hard decision what to use the towel for...
To bring it all together: If you travel alone, can live with nearly no space and want to be centrally located in Alfama - go for it. But personally I will not go there again. With all the negative points it’s not worth the money for me.