Ann's place is an absolutely brilliant place to stay. It is quiet and very safe. Her house is impeccably clean, and extremely close to public transport.
The bus is a two minute walk away which gets you to underground station (Tooting Bec) in 15 minutes or the overground station (Streatham) in five minutes. Alternately you can also walk to Streatham in 10 minutes if you're baggage free. From Ann's house, you can reach the beautiful town of Brighton in 40 minutes, or into central London in just a half hour using the Northern Line. Heathrow airport is also only an hour and a half away on tube, and Gatwick isn't far either.
Lastly, Ann herself is an absolute gem of a person. She treats you as if you're her own child and has your well being in mind. She does your laundry if need be, or make you dinner and has a full breakfast raring to go. I cannot recommend Ann, or her house enough. I will most certainly be back when I'm in England. Won't even consider another place, nor should you.