We had a great stay at Patricia's place. It is a 4 minute walk to Castelo de Sao Jorge and about a 10 to 15 minute walk for some bus stops and metro stations.
The apartment was clean and the noise level was fairly quiet at night. The stairs going up the apartment are narrow and loud, so we were woken up a few times by guests coming home late (around 2:00 am).
Alfama itself is has a lot of hills and may be difficult for some travelers to navigate. I would highly recommend taking a cab to Castelo de Sao Jorge and then walking 2 minutes downhill from there to get to the apartment.
Patricia was extremely responsive to all of our questions before and during our stay. Thank you for having us!