Halima's place is very nice. If you want to walk from there to the center of the city and other common places to see, it'll be at least one hour. But the metro is just a couple blocks away (and all the metro lines in London are very well connected, so no problem except the cost of each metro ride: around 2,50 pounds).
Since the room is right at the entrance of the house (also the bathroom), it's very easy to get in and out without getting in the way of the family. They were nice and everything was OK! They let me do the check out one hour later (keep in mind that the check out time is early: 8am).
In the room you can hear the steps on the first floor and the sounds from the kitchen/dinning room. For me that wasn't a problem; that's just something to consider if you want absolute silence or if you are a very light sleeper.
You have a supermarket 2 or 3 blocks away. In the same block of that market you have a chinese food place were you can eat for 5 or 6 pounds.