It was really a very nice experience and the main thing you should know is that the description and photos are 100% true. Janela de Lisboa is close to everywhere, we used subway only for trips out of the city. You can walk to the castle, to the bar area, to the famous 28 tram, and more and more by foot.
And a few words about apartment. It is very clean and there is enough space for 4 adults, you will have your own towel and hair dryer. Simply saying w/o sceletons in it's closet:)
Barbara and Miguel are very kind and helpful hosts, there was no problems, but I am sure they can fix anything.
The last thing you should know is the view from the window! It is really amazing, you will feel the spirit and soul of the Lisbon from the first view. This is apartment of your dream and cry if you will stay somewhere else. Enjoy!