We spent 5 nights in Amelie and Marino's place. It was perfect for our trip. We were welcomed by Tania who gave us great local tips and showed us around for a bit after we checked in.
The communication with the hosts was very fast and easy, as well as the check in and the check out.
The location of the apartment is great (in the beautiful Alfama district, surrounded by small streets, beautiful "miraduros" with spectacular views of the city..) although a bit tricky.
Be prepared to climb a lot (it's right next to St. George's castle - one of the highest points of the city), there are a lot of stairs and steep streets around, but the views from the hill and the castle are worth the exercise.
Also, if you like to sleep in, be aware that a bunch of peacocks live in the castle nearby and can be quite loud, especially around 6am.