We stayed at Joana's place for 11 nights and we really loved it! It has a fantastic and very central location. You go out of the door and within 3 minutes you are in the center square, from where you have access to metro, train, taxi stand, shops, restaurants and supermarkets, so you can very quickly satisfy all your tourist needs.
The apartment itself is in a small and safe street, just to the side of the square. It can be a bit loud on the street sometimes, but we really felt that this added to an authentic Lisbon experience, so it never bothered us. The apartment is spacious, with a big living room and two separate bedrooms with double beds. We were with 3 people in total and the place was more than comfortable for all of us. The kitchen was well stocked with amenities, so it was very comfortable to use. We like to cook, so the big fridge, the oven, the microwave and all the pots and pans were a big plus for us. The bathroom has a separate shower cabin and a toilet.
Check in and check out went very smooth and even though we never actually met Joana herself, she was very responsive and friendly over text and answered all our questions and requests promptly. A friend of hers met us for check in, and she really took the time to give us local tips, including tips about good restaurants, museums and how to best get around the city.
Overall we really loved our stay in Lisbon and Joana's place and we would definitely stay there again!