Booking-calendar.net is a cloud based property management system. Application manages all your reservations, guests, invoices and everything else that you need as a rental provider. App sync all your reservations to sites like Booking.com, AirBnb, HomeAway and many others.
In order to use it, please register first at Booking-calendar.net where you can create mobile device with token. You'll need that token to activate your Android phone app.