Both these places are near Narita
http://www.japaneseguesthouses.com/d...atsuhonten.htm (on the guests' comments section the last one is about 'Kukuna' a completely different hotel)

And (slightly cheaper)
http://www.japaneseguesthouses.com/db/chiba/otakeya.htm

I tend to stay at the Mercure on my last night in Japan as the rates for a double room can be very competitive (usually around 9,000yen). I like it as it is right in Narita town rather than in an area only accessible by airport shuttle/taxi like most of the NRT hotels.

Comfort Inn is another economical choice for those wanting a single room in town.

There's lots to do in the evening in Narita - izakayas, bars and restaurants are equally geared towards foreign patrons and Japanese locals and travellers. A calm stroll through the temple grounds before checking in for a morning flight is a not to be overestimated experience.
Many of the regular shops (most of which will close by 6pm) sell local specialities and are by no means tourist traps.

The train will get you into the airport within ten minutes and the trains depart regularly (just don't use the Narita JR station! Aim for the Keisei line instead)

If you have the time, then by all means go to Tokyo. But if you just want to relax and enjoy a quick, stress-free immersion into Japanese culture, then a ryokan overlooking Narita Temple is not a bad idea at all. If someone I knew had your itinerary I'd suggest staying in Narita as an option too.