Map for K2 is a handy plugin for k2.
In the backend of k2'll have to create two custom field of type text, relative to the city and the other for the address.
Just then install the plugin in the backend and show him the names of these two fields.
In the frontend if we open a view of k2 with the list of items, where within them will be shown the city and address, we will see next to a map of markers already populated.
The potential of the plugin is that you do not need to enter the coordinates, the script can deduce it by itself (if you work locally must be activated to connect to the internet).
It can be very useful for the reviews, if you configure k2 in order to ensure that users can create new products and enter the city and consequently addresses automatically will create the map correctly populated.
For any doubt or question please feel free to contact me!