I used Airbnb for the first time and I don't think it can be better than this. Rui and Carlos were very helpful. Rui came to pick us up from train station which was much appreciated. Carlos was waiting for us at the apartment. They made us feel at home as soon as we entered the apartment. They explained us everything about the apartment and provided us with cookies, choice of red/ white/port wine, some basic stuff like milk, butter, fruits, tea, coffee, bread etc and Portugese pastries. They also helped us with all the information about main attractions in Lisbon and nearby areas to cover. Apartment is family friendly and at a stone throw distance from a supermarket Lidl where you can buy all the stuff needed. It is at a walkable (around 15 mins) distance from downtown or you can take metro if you wish (not more than 5 mins walk).
I can not find any fault with the apartment and very much appreciate their hospitality. I would highly recommend Rui and Carlos apartment.