I loved my stay in Lisbon and in Maria's wonderful apartment. I was travelling on my own for that weekend and I had so much space to myself. It is the perfect size for a couple, plenty of room. The apartment is tastefully decorated and it was spotlessly clean. It really felt like a little home away from home. I particularly liked the view on the aqueduc in the evening, as the sun sets. On a sunny day, the apartment is wonderful and bright, with light coming in from both sides, with a long corridor with wood flooring in between.
The public transport system in Lisbon is truly excellent. There is the option of the bus just outside the apartment (great frequency during week days) and the Metro just 10 minutes away (great frequency all the time). While it cannot be described as located in the city centre, the apartment is within very easy reach of the city centre by Metro and bus.
If you are in any way interested in art, the amazing Calouste Gulbenkian foundation and museum is a 15 minute walk away from the apartment. Allow for a minimum of 2 hours (more is preferable) to truly enjoy the amazing collection.