I am South African but have been living in London for the past 12 years. I own a flat in SE London and am new to Airbnb so haven't hosted yet but I think a good guest cleans up after themselves, has good conversation and doesn't make a ton of unnecessary noise.
I am very lucky in that I have friends who live around the world and my travel policy is definitely go where your people are as I love the opportunity to meet locals and learn what it's really like to live in a particular place. Favourite travel destinations are Plettenburg Bay, Antigua, NYC, Bhutan, Hong Kong, India.
My travel / holiday style is definitely more along the lines of equal parts relaxing and seeing stuff, if it's a beach destination then I glom on a million books but if it's more city break then I definitely make an effort to check out the galleries and restaurants, oh yes.
So in a nutshell I'm a respectful guest, am self sufficient but always interested in meeting new people and learning something new.