Antonio was very very responsive, he would often answer within a minute of my Airbnb message, at most a few minutes. I had to contact him a few times during my week long stay mostly because of issues and questions on my end, and he resolved everything quite quickly.
The space is pretty good, it has a lot of amenities including kitchen and washer, which was great for staying for a week in London, to save money by not eating out as much.
As other reviews have mentioned, the front room is right on the street, where there will be a lot of people and car noises at night, especially the garbage trunks, which I had ear plugs to deal with. If that doesn't work for you, you may want to use to the bed in the kitchen area instead.
Location is awesome, a block from the Goodge St tube station, close to the theaters and soho and british museum. I got 7 days unlimited tube pass but I don't think I ended up using it everyday. Within a block, there are supermarket, pharmacy, countless restaurants and even two thrift stores (I had to buy a cheap jacket because I didn't expect london to get that cold in mid sept).
I had a great stay in London, thanks!