If stairs are not a problem for you and you don't need absolute quiet to sleep: definitely stay here!
Jorge, Angélica and Manuel were great hosts. Quick to answer, willing to negotiate according to my needs and super helpful with everything.
The apartment is good, it has all you need for both: holidays or a long business trip (which was my case).
On top of being a well located, clean, and very well equipped apartment the fridge was full: from ingredients to make a good snack to local and tasty cheese & wine. For people who arrive late and starving, it's GREAT.
As I said, it's important to note that you have to climb many stairs (4 stories to be precise). And, as many buildings in Lisbon, this apartment can be noise. It will depend on how loud the people upstairs will be. I can normally sleep through anything, but a couple of times I was woken up by what seemed to be some kids jumping at 7am. But overall, for the 20 days I stayed there, it was fine.