We had a wonderful stay at Dorothee's and I would highly recommend to stay at her place.
The apartment was very clean and the neighborhood was quiet despite being at a street with constant traffic.
The apartment is located between several bus stops and an Underground station is a mere 5-8 minute walk away. It took us between 10 to 30 minutes to reach all the attractions we wanted to visit. A little longer to get to Greenwich or Brixton but that was absolutely worth it. You can reach Camden Town by bus which takes just a few minutes or stroll through Kentish Town by foot. I'm sure Dorothee will give you all the directions you need like she did for us.