I had a fantastic stay in Priscilia's apartment for my few days in Lisbon.
Communication was quick and easy at all times and Priscilia was always very helpful.
The apartment itself is clean and spacious with all the important things you might need.
The location is right in the heart of Bairro Alto and it's a great base to explore Lisbon and public transport is all around, e.g. a 5-10 minute walk to Rossio station if you want to visit Sintra.
As it's so central there's a lot of nightlife all around - and the locals like this to go on late! However, it's nice to watch all the comings and goings from the balcony and absorb the atmosphere.
Also worthy of note: one of Lisbon's finest purveyors of Pastel de Nata is at the end of the street (Manteigaria). What more could you ask for?