Everything about my stay at Cecilia's flat was perfect. The flat was immaculately clean, nicely decorated, is very centrally located, and you are within walking distance to everything.
The immediate area itself is great, and full of character. There are many antique stores, restaurants, boutiques, and cafés in the neighborhood. I enjoyed strolling all of the side streets in the neighborhood and soaking up the lovely atmosphere.
Also nearby are 2 of the most picturesque mirodouros; 5 mins. away you'll find the Santa Catarina miradouro, and a short walk up to Principe Real you've got the miradouro de Alcantara.
There are 2 bus lines down the street that have direct connections to places you'll probably have plans on visiting during your stay.
Communication with Cecilia was very easy, and she was very quick to response to questions.
I can highly recommend a stay at Cecilia's. Lisbon is a great city! Give yourself at least 5 days to fully explore the city itself.