I just stayed at 深圳蛇口二店 on 12/4/2008 for one night. I made walk-in reservation for a KING size ($167 RMB for members - you can be a member on-line
www.7daysinn.cn) room with my wife and son. That branch opened for only 2 months. The hotel was clean and new. You will expect a very large bed(clean and clear), a colour TV with 40 something channels (including TVB and ATV), a hot-pot, an air-conditioner, a shower room with all the cleaning accessories.
My wife was satisfactory about the hotel. One thing was very specil about the safety. If the door-lock was not fully locked, the door-lock would "beep" you such that you can lock the door firmly until you do not hear the "beep" song any more.
To me I give 85 mark to the hotel for such a price $175 for one night. If you are just looking for accomdation, the 7-days inn is highly recommended.