Costs:
Coffee in a coffee shop: just like in europe, starbucks prices and fairly decent to very good in many places.
Cost of bottled water in the supermarket: half 1.5 yuans, 1.5l 3 yuans
Canned coffee around one euro
beer
food from next to nothing to 30+€ meals for posher places like where we had the roasted duck at the DaDong
accommodation in hostels around 25€ per double room with ensuite bathroom
metro: each train ride is about 3yuans for most destinations a tourist may want to see. Check this website for tips and info (like how big stations are,etc)
http://www.travelchinaguide.com/cityguides/beijing/transportation/subway.htm
trains: if you can arrange train tickets yourself at the station, they are good value.
trips to other destinations arranged by your hostel: not super cheap, shop around although a van serving one hostel picks up guests from other hostels. Easily arranged in any hostel. No need to plan (much or ahead). Always cheaper to do it once there. Always.
tickets to sights: it varies, check guidebook
visa
flights


big supermarkets western style


links
http://www.lonelyplanet.com/thorntree/thread.jspa?threadID=1671902
http://www.losviajeros.com/Blogs.php?b=7258
http://www.lonelyplanet.com/thorntree/thread.jspa?threadID=1671902
http://www.tripadvisor.es/Hotel_Review-g303712-d1795465-Reviews-Charming_Inn-Yangshuo_County_Guangxi_Zhuang.html