Perfect flat for exploring Lisbon. The street it is on is very pretty and we walked or Uber'd everywhere. We really enjoyed the local Copenhagen coffee shop and sunday flea market. There's lots of stores close by which sell fresh fruit and veg and the apartment has all the things you'd need to make a meal.
We loved the shutter blinds making the bedroom really dark for sleeping. It was quite noisy which I am used to as I live in London but I'd advise bringing ear plugs if you are a light sleeper!