You and your wife chose and requested via Airbnb to stay an extra night after your initial 7 night stay.
Surely after 7 days of as you say a horrible experience and feeling very bad, you would have ensured you didn't stay in our home for another minute, let alone a whole 24 hours?
Heathrow has restrictions and a night quota limit and also has a voluntary ban that prevents flights from landing in the early hours, in addition there is triple glazing on all of our windows.
There is an office space to the rear of our apartment and the handful of office workers leave by 5.30 to 6pm.
We accepted you with less than 24 hours notice and worked very hard to make you feel welcome.
For your information Electromagnetic fields exist anywhere where there are electronics. They are generated by current. If they were dangerous then anyone with lights in their house would be in danger.
Regarding the wifi we turned it off for you at the router and it was unplugged for you, after which you requested my secure data and Sky account details so that you could contact Sky, my internet service provider, to ask them to disconnect the flat's internet connection. I was somewhat surprised at the demand for my secure data and I politely declined to provide the wifi account details, and further secure data for security reasons.
After that demand, understandably we felt concerned about the packages being shipped to our address and the upset this could cause to our neighbours.
The mistake was to overlook reading your past reviews from hosts, as in truth had we read the last 15 or so reviews we would have declined your stay so a lesson learned.
The flat was in the worst state of cleanliness ever and took hours to clean the bathroom after your visit, so very far from an excellent state as you mentioned.