Hi Mandy
Greeting from Peggy.
A 7 days China tour to Beijing, Datong, Luoyang, Xian and back to Beijing is not enough. Generrally, a 7 days China tour only can cover 2-3 cities such as Beijing-Xian or Beijing-Luoyang/Datong-Xian.
And the suggested itinerary for your 7 days tour can be
Day 1 Arrival Beijing
Day 2 Beijing day tour
Day 3 Beijing day tour
Day 4 Beijing to Xian
Day 5 Xian day tour
Day 6 Xian back to Beijing
Day 7 Beijing departure
Or cover 3 days
Day 1 Arrival Beijing
Day 2 Beijing day tour
Day 3 Beijing day tour
Day 4 Beijing to Luoyang
Day 5 Luoyang day tour, Luoyang to Xian
Day 6 Xian day tour
Day 7 Xian back to Beijing, Beijing departure
And if you still looking for a tour covered Beijing, Datong, Luoyang, Xian, I can tailor make it for you.
Thanks for your time
Peggy