When my son received a transplant at Harefield Hospital we knew that we were going to need to stay for many weeks close by. After a short stint in Parkfield House on the hospital site we relocated to Sam's which was a seven minute walk away. This walk was direct, with a path that is directly opposite Sam's road.
Sam was very helpful, being available on iMessage and responding very quickly to questions or requests. Her AirBnB is clean, warm (full control over heating), and in a nice, quiet residential location with plenty of parking in her cul-de-sac.
There are plenty of creature comforts; Sky Q with the ability to record and watch on either TV (just don't delete the Peppa Pig episodes that Sam's young daughter watches!) which includes the Sky Sports channels and LFCTV (a real treat for me), and reliable and fast WiFi. The fully equipped kitchen enabled us to cook various meals and having a washing machine was a bonus too. Sam has thoughtfully provided radiator drying racks. There is excellent shower water pressure and temperature. There were occasions when a third member of the family stayed with us and Sam was very accommodating in letting us bring our camp-bed into the bedroom (there was enough room at the bottom of the bed). Sam does not allow smoking in the accomodation, which was not an issue for us, but there is a small private area outside the bedroom accessed by French Doors that would allow a smoker to do so. This location benefits from a good 4G Vodafone signal which was important for me as I needed to make and receive work-related telephone calls from time to time.
As was the nature of out stay, we didn't know for how long we needed to be in Harefield. Sam was very generous when we needed to extend our stay by ensuring we received applicable discounts for the extra days.
I cannot think of anything negative about Sam's AirBnB; perhaps the memory-foam bed which many will see as a bonus, whereas my preference is for a sprung mattress, but each to their own and I'm very much not-picking here for no good reason!
If you happen to find yourself visiting someone in Harefield Hospital I can very much recommend Sam's AirBnB. It was an oasis in a desert for a while for us.