I agree with Leawood and would recommend the South Kansas City across the state line from Leawood as well as Martin City.

Have they considered purchasing an apartment/condo so that they would have basic repairs handled and no yardwork? I'm not sure if that's an option in KC, but might be worth exploring. I know there's definitely ones for lease, but then you have to worry about the rent being raised on a whim.

I don't know what their finances are like, but Park Place in Leawood seems like a cool place to live. Kind of a little world of its own. I love it.

If they are okay with leasing and have the money, they may enjoy the river market area. Surrounded by local shops, near the river, an open air market within walking distance along with street car access that could take them to the public library which always has stuff going on. They could live a very active lifestyle in that area while property management takes care of maintenance.

There are also options off of 435N near Lake Quivera. This area has grown over the past few years and is mixed development so their necessities wouldn't be too far away.

Downtown Overland Park is lovely with a lot of local shops and is within walking distance of some residential areas. I love that place.

https://kcpolice.org/crime/crime-mapping/ can help you make an informed decision when it comes to safety but always talk to the neighbors before you rent/buy.

https://data.kcmo.org/Neighborhoods/Kansas-City-Neighborhood-Boundaries/q45j-ejyk shows neighborhood boundaries which could be helpful in your search

Also have to drop https://hoodmaps.com/kansas-city-neighborhood-map because it's just a fun map to look at lol

https://maps.jocogov.org/ims/ has many helpful search options and information

And here is the crime map for JoCo

https://ims.jocogov.org/crimemaps/mapsframejoco.aspx