Daphne's house is clean and the room she provided is comfortable. I'm someone who's quite picky about my toilets, and hers was pleasant to use.
However, when you're traveling around every few days, time can be of a factor, and if you're going to be traveling around Central London a lot, her house may be a little bit far (35mins by DLR and Tube). It's however, very close to the Tower Bridge, which is where I went on my first night staying at her place.
Daphne, as a person, is nice. I chose to leave after staying at her place for a night because I felt that it was a bit far for me, and asked her if I should get a refund. I understood that it's last minute notice, and wouldn't have minded if she refused. But she was a bit brusque in her reply, which I was slightly taken aback by. But this could be due to the last minute notice.
Overall, if you don't mind the distance, I'm sure it will be a pleasant stay for you.