I have checked the altitudes for Ringgis872 and the bus stop at Aeschau Dorf, as identified by AlpenRose.
I used the SwissTopo topographic map, at this link.
map.geo.admin.ch/?topic=swisstopo&lang=e n&bgLayer=ch.swisstopo .pixelkarte-farbe&layers=ch.swisst opo.zeitreihen,ch.bfs. gebaeude_wohnungs_regi ster,ch.bafu.wrz-wildruhezonen_portal,c h.swisstopo.swisstlm3d -wanderwege&layers_visi bility=false,false,fal se,false&layers_timest amp=18641231,,,&X=1959 65.00&Y=624637.50&zoom =8
Ringgis 872 is at 1pproximately 870 meters, so the name is probably the altitude - 872 meters.
It is good that he looked that up, because your location will be closer to Signau than to Eggiwil. In fact, if your host does drive you to a station, they might wish to take you directly to Signau, which is roughly 7 km from Ringgis 872.
You have picked a very attractive and typical Swiss countryside location in the Emmental.
I have stayed many times at nearby Langnau, as well as Signau. I have walked from Langnau to Signau via Schüpbach, where there is a nice , old, wooden covered bridge across the River Emme.
The bus stop is at approximately 694 meters. That is a notable height differential for me, with my sore knees. if you are young and fit, it should offer no problem, but if you have luggage, getting it up that hill might slow you down a bit.
Alpenrose has given precision to my comment about reduced service on weekends, and confirms no service at 5 AM. All of my previous comments about time are wrong, because i used Eggiwil as one stop, when I should have used Aeschau, Dorf.
Here is a screen grab for May 2, 2016. I requested 4 AM. 6 AM is the earliest, as noted.
Langnau i. E. (im Emmental) is a substantially larger rail station, with more trains in various directions.
I tried a journey from Langnau to Zürich on May 2, early. Langnau is about the same distance from Ringgis 872 as is Signau.
The earliest train to Zürich leaves at 0458 from Langnau i. E.
There are many places to stay in Langnau i. E. I usually stay at the Hotel Hirschen, 5 minutes from the station. A nice location on a small plaza. Good kitchen.
Although I know nothing about it personally, there is a Hotel Bahnhof very close to the station, across the street at Bahnhofstrasse 5, with inexpensive rooms and a "Massenlager" ( Dormitory.)
The countryside near Aeschau is very beautiful. Much nicer than the view of the train station at Langnau.....
I went a bit further to seek the identity or status of ringis 872
I used the Emmental B&B website:
There are some other B&B's in the area, but none was listed for that location. For what it is worth.....