That will display a map, but it won't display the local business listings which is part and parcel of Google's Knowledge-Graph driven maps listings. Also, the <IFRAME> will add non-trivial amounts of latency to the page display.

When you type in something that generates a map these days, you get Knowledge Graph entries, Maps, Related places and people, and a bunch of other ancillary things. How can Google simultaneously iterate and evolve their search, and at the same time, provided a fixed API for federating this stuff?

This is one of those things that works much better in theory than in practice. I'd rather Google federate social and login before messing with search answers.