Both Margaret and Adrian were extraordinarily gracious and welcoming hosts. Do ask them for directions (Google Maps can be misleading, as I discovered to my cost, but they were great about helping me find my way.) I stayed in the clean and airy single room. There are two grocery stores within easy walking distance, a lovely park just across the road, and a Tube station 10 minutes away (from which stops north of the river are ~20 minutes' ride.) I found it very convenient to the Wellcome and British Libraries, but the same principle applies if you're in London for more traditionally touristy destinations.