Running a successful global hub like Heathrow Airport requires hard work and dedication from thousands of people and the work can be fast-paced and hard, but at the same time very exciting. Your interviewer poses a question like this to ensure that you have a solid idea of what day-to-day life will be like in the job you are interviewing for and that you see yourself thriving in that environment. Give your best interpretation of what the work will entail and then use your prior experiences and work style to convince your interviewer that their environment is the absolute best fit for you.