It was my worst hotel experience EVER!!!
I was welcomed into my room with dirty bed sheets (douvet had excretion stains, as well as urine samples).
Although, they changed bed linen and all, I couldn't bring myself round to staying there overnight, so decided to shower and head to airport, and wait for my flight in the terminal, as opposed to staying over night.
All the other local hotels were fully booked, so waited 8 hours at Heathrow for my flight, but anything was better than sleeping in a hotel, that thought it was ok to present their room with such distaste.
However, on complaining to hotels.com and showing them pictures of the room and it's bedsheets, I was refunded in full.
So I thank hotels.com for calming the situation.