We (3 adults) were there for a week.
It was a super stay. David had been very accommodant to adapt everything to our travel changes, communication was very easy.
Once arrived, there was a lot of touches to make us feel at home.
The place is large, quiet, and has all the comfort you need for a long stay.
Germania street is very well located to discover San Francisco. Max 20mn ride by car or tram/bus drives you everywhere, it is very central.
And the immediate neighborhood is very safe, plaisant, with good cafes, restaurants, and parks.
In a word: perfect 👌