[CS] Write down on your notebook about your host information immediately

When your hosts accept your couch requests, they will tell you about their information.
Where they live, and phone numbers, where to meet, what they want you. 
Some hosts accept requests, but they forget to tell their information.
If it happens, ask them again as soon as possible, 
because you will be in a trouble. Obviously, where can you go if you don't have the address or number.

When you are are traveling, it's always difficult to have internet access.
When you can read their information, it's better to write down on your notebook immediately.
Otherwise, you will have to find internet access again, 
you will have to waste of you time and money, and so on.

Even if you use smart phone, it's still better to write down,
because when you need important information from your smart phone,
I don't know why, but your battery is always dead.
And do not write down on a piece of paper. You will lose it,
and it's not easy to keep it for a long time if you write on a piece of paper.