During my month trip through Europe, this is the worst experience I have had with an airbnb host. While I've stayed at places in the past where it may not be the cleanest, the most convenient, or the most comfortable, the host has always acted friendly and professional (and therefore, I have never given anyone less than 4 stars).
During on my travels from York to London, the train was delayed, and I was not able to check my email due to lack of data service during my trip abroad. When I arrived at 4pm, instead of 3pm, the host actually pulled me and my family aside and lectured us on how "unprofessional" we were for not replying to her airbnb message that she sent out less than an hour ago.
First of all, delays happen when people are traveling in an country they are not familiar with, as an airbnb host this should be expected from time to time. Second, not everyone checks their airbnb app/email every minute of the day, especially when they are abroad. As a host to people who is traveling/on vacation, there is never a reason to pull them aside and lecture them for 10 minutes before letting them settle in their room, it just leaves a bad taste.
So with all the other choices I have in London to stay at during my future visits, this will definitely not be a place I myself would stay at. Nor would I recommend this place to any friends or family.