In addition to a decent cup of coffee (which starts at around 35RMB), Demo Cafe has the added bonus of some pretty cool furniture, most of which was made by the owner and most of which is for sale.
There's a full menu of Western items like steaks and pastas, and a decent wine list. You'll also find the typical array of desserts, such as tiramisu and cheesecake for around 30RMB.