You dont need to use IOS maps on IOS Reservations as IOSR has its own map system.
Just set the hotel location's coordinations.
Go to google maps
, find the location you are interested in.
Click on the link icon
to get the URL google gives you to that exact location, this URL will be something like this:
From the above URL you need only the ll
Copy-paste this into the hotel's edit page in IOSR in the corresponding field and you are ready.