The positives are that the apartment is very clean and in a great location. The terrace is fantastic -- so rare to have something like that in London. I hate to mention negatives ... but I do have to say that the feeling of the place, however, was meagre. The only chairs are folding chairs. The only light in the living room is the overhead light. There are no bedside tables and only one lamp in the bedroom. The mattress may be new but it is low quality compared to any other AirBnB I've stayed in. Same for utentsils and everything in the kitchen -- it's all there but feels like no one cared. And although Marta met us personally, there was nothing welcoming in the apartment -- no information about the local area, no "how to" work things in the apartment -- so I had to contact her with basic questions, such how to turn on the heat (not obvious) or return the keys.
Also, I have to say that we didn't appreciate being told on arrival that the washing machine was to be repaired "sometime" on Saturday. Marta seemed put out that we weren't okay with this -- we didn't want a stranger coming in, interrupting us, at an undetermined time.
All in all, Marta is nice and the bones of this place are good, but it feels like it was furnished on the cheap and needs some love. With a small investment it could be amazing.