We have rented the place for just 2 nights, which was perfect. The location is very central so the beautiful, authentic and diverse environment of Portugal can be fully experienced from the area of Alfama. The flat was not big, but specious enough for 2. Something to be aware of is that there is only one little window in the kitchen and 2 windows in the main door, so make sure some are opened as much as possible in order to air your bathroom and the flat overall. We had no major issues while the stay, but Celso was very responsive via Whatup and also Andre was helpful. Thanks to you both!
2 places we visited are worth mentioning here: "Tacos and Friends" and "Romana" pizzeria. Also, there is a little square 5 min walk away with nice places for breakfast and sunbathing :) there was a market there on Thursday, which could enhance your experience. One thing to bear in mind is that the area in general very much up and down the hills and can be slippery at times, so make sure to take comfy shoes. This is part of the experience though, so we personally appreciated rather.
The metro station is also not too far away. If you are planning for rather short trip, i would not suggest going to any shopping centers, unless it is really nice outlet you manage to find or specific shop you are after. They are huge spaces, shopping can get tiring, so you risk loosing time and energy. If you contemplate what transport card to buy while travelling, make sure it covers metro and bus as minimum. You can buy it from the machines located at any metro/underground station.
Enjoy it!