Communication with the company that runs the apartment was fluid and to the point. Since it is a company and messages were not always signed, I do not know with whom I was actually communicating. This also means communication can feel a bit impersonal. I never met Joana or Teresa. I only met Paulo to do the check-in.
I do recommend this place. The place is well represented by the pictures. I would highlight (1) the size (much bigger than most places in Alfama); (2) the terrace (good amount of sun and river views); (3) the full couch and accompanying armchairs in the living room (also unusual in other small Alfama apartments); (4) the light (all rooms have light); (5) the calm and peace of the place; (6) the good heating (I was there in January); and (7) the location in the building (top floor) and in Alfama (very close, for example, to the Flea Market, to Santa Apolonia train station, to the neighborhood of Gracia).
There is, however, a major problem: the internet connection. I was there for four days and it got worse and worse as the days went by. The last day I lost it almost completely. I also lost the tv the last day. I would recommend that you check whether this has been fixed before you book the apartment, especially if you need internet to communicate (as I did since I did not have a phone) and to work. There are not so many internet cafes around--and sometimes you do prefer anyway to work in the nice living room or terrace you have booked.