Nearby quaint older walkable small towns with mom and pop type small businesses include Wayne,Paoli,Devon,Bryn Mawr,Narberth,Ardmore. They are within a couple miles of Radnor. Be warned although generally upscale communities these are older towns with older apartment complexes.
For newer corporate housing/newer townhouses etc you will be better off looking west + north of Radnor in towns such as Exton,Eagleview,West Chester, Malvern,Plymouth Meeting,King of Prussia. All are a 15 minute- 1/2 commute to Radnor.
West Chester stands out in the fact that it has a very nice main street type feel to it with a library, coffee shops,restaurants etc.. Although the townhomes and apts are a mile or so from the town center accessible by public transit(bus)
Eagleview in Exton is a gigantic residential community that has its own little town center(starbucks-quiznos etc.). i would look into that if you have the time.
Claremont at Eagleview
home
This is one of the largest corporate housing developers in the usa. I'm sure they have all kinds of developments in the area.
Oakwood
Temporary Furnished Apartments, Corporate Apartments, Serviced Apartments and Extended Stay Housing
Good luck.