We stayed at Anna's apartment for nearly a month and had a fantastic time. As mentioned by other's, the apartment is nice and roomy and has great storage. It is a long apartment with windows on the front bedroom overlooking a busy street and a lovely patio out the back which overlooks two courtyards that is very private.
While you can walk into the tourist areas which takes about 20 mins, the apartment is close to Marques metro station which is on an excellent line that takes you into the city centre and across the river to Gaia where the Port houses are. There is also a lovely little park and bus stops to Foz and other beaches from there as well.
We has a couple of heat wave days and the air conditioning worked well. The apartment is on the second floor but the stairs are wide and easy to walk. Manuel also organised for a basic clean and change of linen half way through our stay.
The other thing we liked about the area is it is not very touristy. We ate at local restaurants which were really well priced and the food was good Portuguese food. There is also a small supermarket very close and larger ones 10 mins walk.
We would certainly stay in Anna's apartment again and highly recommend it.