Kenji is a vey nice host and we had a wonderful stay in his appartment which is cosy and well equiped. The whole family - parents + 3 teens - enjoyed a lot the stay there.
Location is great, very easy to visit the different SF quarters either walking or using bus.
Welcome with tea and thorough explanations about what could be done in SF was very appreciated. Kenjii gave us very good advises for restaurants, museums, shops for food, he had prepared a book full of maps, flyers, addresses ... which was really useful.
In summary I highly recommend a stay in Kenji's flat.