My family and my best friend's family are planning a European vacation for next summer. We would like to fly in to London from the U.S., then travel by train to other countries. We're specifically looking for hotels. We both have families of 4, so 8 total. Our kids are all over the age of 18. There are so many hotel options, it's overwhelming. We just need a place that is clean and somewhat close to the attractions. We tend to look at reviews as well. We will only be in London for 3 days. Any tips/advice would be helpful. TIA