Hi,
I have experience development like it.
Your requirements is no problem for me. I'm ready always to start your project.
I will finish your work with in 7 days, since Google map, send feedback, promotion, enquiry .. these functions are no problem for me.
I want to work with you, firstly please let me know web service URL and the other more detail requirements.
If you send me any message, i can send you my previous project apk file for Android.
Awaiting to hear from you soon,
Thank you.