Martin's place was a great base to explore Lisbon. The 62 steps are not so bad, really, and the view is worth it as everyone says.
Even though the neighborhood is very central (convenient to Rossio train station and lots of the main downtown tourist areas) we found it quiet at night -- a nice surprise. We found we could walk everywhere we wanted to go.
It's a quirky layout and it's decorated to feel like a real home, not like some spare/spartan "design" Airbnbs. And it was spotless.
Check-in was a dream with Martin's business partner Paulo, who took the time to show us everything about the apartment (it has a funky old gas hot water heating system) and talk to us about the area. Super professional and friendly. We had a great stay!