My wife and I stayed at Joana's apartment in Lisbon for 4 nights and really enjoyed it. Very clean, spacious and in a great location. The check-in by Guilherme was great - answered all questions, helped us with our luggage and provided many recommendations on places to eat and things to do. The apartment is right next to Intendente metro station and it's also really easy to walk around as it is about a 10-15 minute walk to a couple of central squares. Overall a great place and we recommend it.
There was only one downside - the neighbors. They can be loud - particularly between around 11pm - Midnight. They talk in the hallway and generally make a lot of noise. It's not so bad when one is in the bedrooms, but if one is in the living room trying to read, it's annoying. However, it's also short-lived and this wouldn't prevent me from staying at Joana's again. If we are in Lisbon again, we'd certainly stay at Joana's again.