We can peer public over:
GraX - Graz, AT
VIX - Vienna, AT (also routeservers)
Private:
XINON Graz
Citycom Graz
EDIS Graz
InterXion Vienna
IP.One Vienna

No ratio requirements for peerings.
Also interested in cheap outbound transit if available.

v4 prefixes rec. 150 / v6 30