Airport shuttle bus from Tianfu Square to Chengdu International Airport and its interval frequency

I need to do self transfer from Spring Downtown Hotel toRongcheng Times Apartment in Lihua Street, Tianfu Square. How to go there via subway ,how long and how much? if taxi, how long and how much? Where can I take airport shuttle bus from Rongcheng Times Apartment in Lihua Street, Tianfu Square to Shuangliu International Airport? how long to the international airport and how much? Any foreign senior citizen fare applicable? It operate from what time to what time? What is the interval time like? Airport shuttle bus got a baggage compartment area to leave my big luggage in the bus?