Staying at Katherine and Craig's was a great experience. They're great hosts and everything was very clean and cozy. Their apartment is quiet and far from the touristy locations but close to a lot of public transportation (from Heathrow take Piccadilly then Central then there is a bus stop down the street, just use Google Maps). Katherine was nice enough to offer us breakfast Sunday morning but we had a lot of places to go to that day. They were both very helpful with directions and were very available to us. I think my only complaint is that the bed is pretty springy so it's hard to sleep on for more than 2 nights. Overall, I think they're great hosts and it was a good place to stay.