Transfer from Hotel New Otani Chan(jianguomenwai avenue 26, Peking to airport?bus/cab/price/time?

you can take a taxi to airport express line departure station DongZhiMen

from your hotel to Dongzhimen (东直门), taxi travelling time depends on traffic condition, normally will take 20 mins, from DongZhiMen to BeiJing Capital Airport (T2, T3) is about 20 mins.

anyway, all depends on traffic condition, you may just take a taxi if not travel on rush hour, would cost you approm. 120 CNY (15 EUR).

if you have doubts in traffic condition, get a taxi to the nearest subway station, and you can connect to airport express line from there.