HI Hansama -
<<"I would prefer to focus on villages rather than city.">>
This site has a lot of information about the Bernese Oberland, including more specifically, the Jungfrau Region.
The villages have their own links, which you can get from those pages, or by searching under 'Where to Go" or searching by name.
It is good to work with a map. There are many suitable maps, but Iike this one:
Check out the menus , especially under "Points of Interest/Traffic."
Zoom in to zoom level 32 or larger, and the transport lines become very visible.
Here are the links you should check on this site:
All of those are acessible from the first link - "Where to Go."
On the link for the Jungfrau Region, on the lower right, the villages are listed by name.
Here is a useful bit of light reading about the region:
I agree with Gunsel. You have made a good plan to spend several days in the region. That will give you your best chance of good weather to see/visit the high mountains.
If you have not yet discoevered the timetable, this link is valuable, and the tips on the first page deserve careful study:
It will let you see that a trip to Bern, for example, is easy, and a good choice for a rainy day.