I think the secret is to find one that is clean, professionally operated and that will provide you with some quiet or privacy. Some coffee shops would be way to busy for signing contracts.
Many contracts are signed at the customer’s place of business or even their home if you are dealing with B2C.
As previously mentioned some communities offer co-working spaces that can be used for purposes such as this. They may even be available by the hour, rather than having to make a longer term commitment.
One good thing about a coffee shop is that a cup of coffee is cheaper than renting a room.
Thanks for your question!
Question originally asked at Quora.com