First up, you've got a great host on your hands. Secondly, check-in is nice and simple as is checkout. The only major thing is that tired legs will notice the stairs, I only mention it because I suffered after 44 miles of cycling! The room is huge, with a great quality bathroom, a kettle, a microwave, a fridge and a surprisingly comfortable bed. It didn't look too much like it would be, but I was impressed. Same with the armchair, I spent hours sat on that very happily. Plenty of wardrobe space and lots of drawers. The area itself is pretty quiet, although do remember you're close to Heathrow so the occasional plane noise can be heard early morning/late at night!