Martina has been an exceptional host. I have stayed in her flat with a friend and we had everything we needed and more. The check-in was flexible and completely effortless and Martina answered to all our questions immediately and friendly. We didn't get the chance to converse a lot as we were always out exploring the city but that was also completely fine with Martina. The flat is very clean and tidy and is quite cozy. It has access to a wonderful garden and is very quiet. Although it's in Zone 4 it has very good connections to 2 railway / overground stations and there's also a bus connection to Tottenham Court Road / Leicester Square and Trafalger Square that runs 24h, so getting to and from the apartment is super easy.
Martina did everything to make us feel at home. There's been cute name tags on the door to our room, we were free to use the kitchen and drink as much coffee and tea as we liked and she even made the effort to write a manual for her guests complete with information on the area, tips for dining, shopping, sight seeing etc.
I definitely recommend her as a host and I will gladly check in at her apartment again when I'm in London.