We really liked the airbnb because it was between the locals in a very nice and old neighbourhood. Be prepared for 4 steap stairs before you enter the house. The house is very clean. The owner answered very quickly. It's close to different types of public transport, but walking from here (Alfama) to Place di Comercio is about 15 min. The only thing was we didn't know (our problem/mistake) about the €30 cash fee if you arrive after 10 pm. We weren't sure to make it (expecting to arrive 10min later) so we took a taxi which is way more expensive. There is tea & coffee available :€