Sofia's place is located in the centre of Lisbon. There are plenty of restaurants, pastry shops and small stores all around it. A lot of attractions are located in the vicinity. The apartment itself is refurbished and everything looks new. All the necessary amenities are available (we have especially enjoyed the coffee maker). While there is no central heating in the building, there are sufficient options in the apartment (air conditioning and a mobile radiator).
Sofia is a professional landlord and communicating with her is very easy. She is flexible and more than willing to help with any issues.
That being said, the level of street noise and neighbour noise is significant and I recommend having ear plugs with you if you are not a heavy sleeper or don't plan on going to sleep at 4 AM.