Yes, if you want some one to leave a review on your profile all they need on their phone is a QR code scanner. Ask them to scan the QR code from your app, write a review and submit. The reviews are categorised into three sections, employers/ employees, general and overall ratings. Reviews from customers or general public will go into the general category.
No, you can be anywhere and choose the location when setting up your vacancy. You can also change the location to tell the employers where you live or where you are in real-time.
Make sure during the set up you select which and how you want to be notified. Once set up you can go into setting and turn on or off notification. Also you can set notifications with the phone settings.