Your hotel is 3 km from LuoHu station. Take a taxi.
The Sz metro goes to windows on the world it is the last stop at the other end from Luohu 14 stations. About 35 mins.You do not need to change trains just go the 14 stops.
One side of the road is windows, and on the other side is Happy Valley, a Disney style theme park, if you are into that. Nearby is a Chinese Cultural Villege.
You can take a train from LuoHu to Guangzhou. Only around 40 mins. There are plenty of signs in Eng.at the Shenzhen railway stn. in LuoHu. The trains are very frequent.
print out a combined rail map of SZ and Hk on:
http://www.johomaps.com/as/hongkong/hkmetro.html
Both are together on one map.
I have used online agents. The one I use is ratestogo.com.They are quite good.
Beware of pickpockets in LuoHu and all over Guangzhou.Wear a money belt under your shirt.
Your hotel Oriental Regent has a website. Take a look.
There is a location map on it.
Have a good trip. Trev.