van Wilder
looks like a possible name change for this hotel, from sinohotel site:
Grand Mercure Hotel, Beijing (The Marco Polo, Beijing)(北京西单美爵酒店 (北京西单马可孛罗酒店))
Address: No.6 Xuanwumennei Avenue, Xicheng District, Beijing.
Phone: 86-10-66036688
ZIP: 100031
Not my area of Beijing so I do not have any recommendations for that area, XiCheng is the western part of the city (Xi = west) possibly street walkers in or near Xidan otherwise, perhaps, someone else has experience in that area.
teltel