The save object documentation enumerates the properties you need—title and metadata. Also, yes, you probably do not need to use the metadata property if all you want to do is display, essentially, a title.
Regardless. I'll cover both storing and retrieving the autosave title and metadata.
Storing examples:
/* Default title, w/o metadata */
<<script>>SaveSystem.saveAuto()<<script>>
/* Default title, w/ metadata */
<<script>>SaveSystem.saveAuto(null, { place : "Armory" })<<script>>
/* Custom title, w/o metadata */
<<script>>SaveSystem.saveAuto("Day 3")<<script>>
/* Custom title, w/ metadata */
<<script>>SaveSystem.saveAuto("Day 3", { place : "Armory" })<<script>>
Retrieving examples:
/* Print title */
<<print SaveSystem.getAuto().title>>
/* Print metadata */
<<print SaveSystem.getAuto().metadata.place>>
/* Print title & metadata */
<<print SaveSystem.getAuto().title>>, <<print SaveSystem.getAuto().metadata.place>>
NOTE: While I stored an object in the save's metadata property in the examples, doing so is not a requirement. Directly assigning it a primitive type—e.g. a number or string—is also valid.