The easiest way is to take MTR Line 4 and get off at Longhua Station! Then take an electric car. It is not expensive to take a taxi! It's very close ~ you can check the map for details! When you come back from Hong Kong, you can take Huatong bus, cross-border bus from Tsim Sha Tsui to the mainland, and car with China Hong Kong license plate! You can go directly to Shenzhen North Station. Then transfer to a taxi and go straight to the destination ~ you can check the tickets of cross-border buses on Huatong Travel Network ~ I hope it will help you!