I've been using AirBNB for about 10 years now, and this is BY FAR THE BEST EXPERIENCE I HAD! We stayed for a month in the flat, which is most conveniently located in the CENTER of Lisbon, you're in any point of the city in less than 20 minutes by ride or metro (also conveniently located about 100 meters from the flat). Artur always replied on time and gave us a terrific walkthrough, provided us with tips, has some goodies for us upon arrival and has the flat not only greatly and stylishly furnished but also perfectly equipped. If you really want to enjoy Lisbon with time and a perfect home base, do not think twice, this is your place! We had such a great time that we're actually considering moving to Lisbon and looking for a flat long term in the area with similar characteristics :)