If you could give a category six stars, this flat would get that in three areas specifically:
First, the location, being right next to King's Cross/St. Pancras, is amazing!
Second, the amenities you will find here are an outstanding surprise.
And lastly, the place has style to spare.
If you are a Whovian venturing forth into a wibbly-wobbly adventure through London, this is the place for you. There are relics from the past that will get you in a proper mood for hoping into your Tardis and seeking what tomorrow has in store.
If you're a Harry Potter fan, you'll appreciate that you won't need to take a Night Bus to arrive at Platform 9 3/4. It's right there, and a tour of Hogwarts (aka Warner Bros. Studios) can be arranged by owl (or their website), and you can be spirited away from King's Cross Station for a day of magic.
Any other British fandoms (ie Sherlock Holmes, Shakespeare, Dickens, Tolkien, C.S. Lewis, etc) are just a simple tube or train away. May I recommend swinging by nearby Paddington Station on your way and taking a photo with a little lost bear who has wandered into the big city?
To put a period on this run-on sentence of a post, Paul's flat is a great place to make your home base for anyone wanting to get the full London experience.
The only con we came across during our stay was some of the other guests in the shared space. You might luck out and spend some time with incredible people from the far-reaches of the earth, or you could end up with some crazies that have no respect for common civility. We mostly got the first, but one night dealt with the latter. Still, it wasn't Paul's fault, and when Joyce, the housekeeper, came by, she made certain they understood the rules.