We stayed at the apartment for a little over a month. We did a lot of up-front research to find a place that met our needs. One of the main criteria for us to pick this apartment was that it was quiet, especially at night. We also wanted to be in walking distance to interesting places. The apartment met both of these criteria very well. It was amazing to be less than 1 minute walking time from the lively Alfama streets, and yet stay in such a peaceful place. The next subway station is a 5 minute walk away (and a 10 minute walk back home :-) Overall, we were able to explore the central areas of Lisbon by walking, and on lazy days using the subway. The subway (and nearby busses) also connect easily to the trains to Cascais and Sintra.
The apartment has a lot of character, and the owners did a great job showcasing some of the vintage design elements. We are not great fans of air conditioning, however, on a few occasions the built-in AC units saved the night. They work very effective and quiet.
The hosts and their teams are super well organized and very responsive. The check-in procedure was not only smooth, but also provided a great overview of things to do, transportation information, recommended restaurants, and suggested trips. We also loved that there was weekly cleaning. If there is one thing that bothered us occasionally it was the front (and apartment) door slamming by some of the other house guests. Not the hosts fault, obviously.
The apartment felt like "home" to us, and we would certainly not hesitate to stay here again on a future visit.