We spent 5 days in casa monicas and think that the location of this charming house is the best to discover lisbon, nearly everything has been walking distance for us. It is really well maintained and decorated and will provide you with everything you need, the bedrooms are really confortable and bright.
Just a little something to consider which is not in the description: you have to pass through the first bedroom to access the second floor or the bathroom.
Carolina has been really great and prompt answering all my questions.
I definitively recommend this house!