I didn't meet Marta but Antonio, who was helping her, gave us all the needed information beforehand and after our arrival.
The apartment is large and very well situated, 5 minutes walk from 2 central subway stations. It's mostly quiet, especially in the larger bedroom. Everything was as described, WiFi works well and we had a very pleasant stay.
Only downside , there was an unpleasant smell in the bathroom but nothing too strong when you can leave the window open, which we did. And you don't live in the bathroom :)