It was an absolutely good decision to make a reservation in this apartment. Julia was super friendly, and the room was also reasonable for the price - especially cuz the location, and the tiny balcony it has. I would recommend it!
Since it is wintertime, make sure to have warm clothes to wear, because there is no heating in the flat - like in most apartments in Lisbon.
Note that the room is open to a busy street, so be prepared if you are sensitive for late-night noises - but as a normal standard is totally bearable.
Julia recommends several good places to eat as well, she was one of the kindest hosts I have ever met.