This was the perfect little apartment for my solo trip to Lisbon. It is centrally located within 10-20 mins walking of many of the main attractions. As you are at the top of one of the hills you are only a few minutes walk from the famous Glória Finicular. Walking this street (which I did many times) will certainly keep you fit!!
Because of the apartments central location you have the benefit of many great bars and restaurants in close proximity. Unfortunately this also means you can experience some noise at night. Of course this is to be expected in any central city location, but something to consider if you are a light sleeper.
A big bonus with this apartment is the roof terrace. It really is the perfect place to take in panoramic views of the city, at any time of day. Perfect for a morning coffee or a glass of wine with the sun setting over the river :)