I really enjoyed my stay at Filipe's home. He is honestly one of the best hosts I've ever had!
Though the room may be small for some (was perfect for me), it was very comfortable. I stayed there for about two weeks and felt right at home. The view is totally awesome too.
Filipe keeps his flat very clean, and very organised. The kitchen is incredibly well equipped. As someone who is constantly travelling but also enjoys cooking at home, I really appreciated having all the amenities.
His cat is very shy but incredibly cute and amusing. I wish I got to know her a bit more but she liked to hide a lot when I was there.
Regarding other guests' reviews... Yes, the flat is a bit cold, at least in the winter, but I've noticed that is the case for pretty much all homes in Portugal (at least the older buildings), so just bring a sweater and long pyjamas.
Also, yes, getting there requires a bit of a hike up a hill, but... hello! this is Lisbon. If you're expecting flat terrain during your visit (no matter where you stay in the city), you're gonna have a bad time. Anyways, it's not that bad compared to some of the roads in this city. And you can always take a bus (797) up the hill if you're completely burned by the end of the day. Plus, you get a magnificent view as a treat. Uber is very cheap in this city here too.
There are many supermarkets and all other necessities within walking distance. I recommend Lidl, just down the hill, for the best prices and food choice.
Finally, Filipe is an incredibly nice, generous, and welcoming host. He was very helpful and very accommodating. I can genuinely say that I felt like I was staying with a old friend.