Beijing airport is very expensive for things like maps, a tourist map of Beijing with both pinyin and Chinese characters is AUD$20. Around Beijing they are AUD$2. If you are thinging of coming to Beijing either arrive in Beijing with a map or buy one from your hotel.
There is no need to buy a map at the airport, you can simply visit the information desk (before or after customs) and ask them to phone the hotel and then translate the name and address into Mandarin for you. Then just hand the name and address to a taxi driver.