I am delivering here a part of what I wrote to Susan and Kent:
Dear Kent and Susanne,
indeed, it is just impossible for me to suggest anything to improve your Airbnb offer. Actually paying a bit more to enjoy it would seem fair to me. We did not have the opportunity of spending time together, but I was very aware of your availability and of your kindness. Frustrated by the shortness of my staying in Capetown, I am quite convinced to go back there one day. Be sure that I'll choose your small studio.
Thank you very much.