Please recommend mexico city private tour

Dear All:
We are isiting mexico city from dec 27-dec30.
Can anyboy recommend a three day private tour?
Or is it easy to book the group tour in hotel?
we are planning to visit:
Teotihuacan Pyramids & Guadalupe Shrine

Puebla & Cholula Full-Day Tour from Mexico City
&  the Zoo.

Or any other better places worth visiting?
We have a 4 years & 8 years girls.

There is a website:
http://www.getyourguide.com
But I called customer service several time and couldn't get any response.
Are they reliable?

Please advise.
Thanks a lot!