Casa Monicas is a lovely apartment in the heart of Alfama. We found it very comfortable for the three of us. It is well equipped, clean & I felt very safe. The only minor gripe was the broken toilet flush!
The house was cool even with the very hot weather. It is 2 minutes from the view point at Graca church, and less than a minute to the Sao Fiore monastery. There are some nice restaurants (traditional Portuguese) on Graca and some bars dotted around. Lots of places to buy breakfast too and a small supermarket.
As a general point I would say Lisbon is not very accessible for less mobile people (lots of hills abd slippery/uneven pavements) so beware! We were planning to bring my Grandmother but glad we didn't. Also, the stairs in Casa Monicas are quite steep - fine for most people but perhaps not the elderly.
If I go back to Lisbon I would definetly book with Carolina again - lovely house & a fantastic host.