At most 60 days to deliver both website and mobile applications (also depends your requests, i assume basic functionality which are location based stores/restaurants can be commented, photo added etc.). I'll use material design UI for website, and native looking for mobile ones.
There shall be backend development and database requeirement to satisfy securely store data and communicate with both website and mobile applications. I suggest to implement restful services for this demand.
I also live Istanbul and work as software developer for a telco company more than 5 years experience.