Lovely little apartment, perfect for our needs. Having the outdoor terrace was fantastic, a great space. Supermarket across the road and two small cafes on each corner. We didnt really explore the immediate area but it's about a 7 min walk to Santa Apolonia station, and we walked back from the Castle within a half an hour or so, but follow the maps because all Alfama has many streets and it can be easy to get lost (but getting lost in Lisbon is lovely).
The only downside is it was a bit noisy from the other apartments in the building, but nothing to bother us, but if you want a really quiet apartment it may not suit.
Didn't actually get to meet Matt, but he had arranged for a friend to meet us and show us the apartment, which was fine.