South Bus Station to Kunming South Railway station

I will be arriving from Laos by bus and want to take a fast train to Guangzhou. I can't find Kunming South Railway station on Google maps. How do I get from the south bus terminal to South Railway Station? Are there any hostels or cheap hotels I can stay at near the station? I don't yet know what time my bus will be arriving. Would it be possible to stay at the station overnight in order to catch a 7 AM train?