Selma's place is exactly as she describes it, she's very polite, tells you all the rules as soon as you get there and helps you with anything you might need.
The place is quiet, clean, close to a large Sainsbury's and various other small shops, pretty much equal between Alpterton (Picadilly) and Hanger Lane (Central) stations (if you're gonna choose a station when you first get there, go with Alperton, the station is a lot less confusing to deal with), but if you go to Hanger Lane- come out of the turnstiles, turn left up the stairs, left at the top, down the main road, through the park, around the corner to subway 7, then onwards!