Sheelagh was my host for the duration of my ~5 day stay (Sandy was traveling). Sheelagh met me at the door with a huge smile and friendly welcome, took me through the flat to show me all the amenities and how things work, let me know how to communicate (including passing notes under the door in a shared wall between the flat and her house!), and then let me come in to use her phone, as I did not have a sim card for my UK phone yet.
Through my stay, Sheelagh instructed me on where to find various stores and how to use the buses to get there, and overall was just the most incredibly kind and helpful host.
The flat itself is immaculately clean, very comfortable, very safe, with every creature comfort one could need for even an extended stay (full kitchen stocked w/ everything, full bath, washing machine, comfy bed, lots of armoire space, desk and fast wifi, TV and DVD player, lots of books). Its location is convenient to/from Heathrow, as well as to/from the city centre on the tube line and several bus lines. Tons of restaurants and shops are on and around Chiswick High St, and there's an excellent organic veggie/nuts/grains shop on Turnham Green Terrace about 10 min away walking.
I highly recommend Sheelagh and Sandy's flat--everything about it was perfect, and I have no complaints whatsoever. (I did get to meet Sandy on the morning I checked out, and he's every bit as sweet and welcoming as Sheelagh!).
Next time I'm in London, I hope this is where I get to stay again. Thank you so much, Sheelagh and Sandy!