I'm not absolutely sure, but I think the standard configurations in the early days of electricity here in Austria were 220/440V 3w DC (Edison system) and 127/220V 3ph AC w/o neutral, maybe with the odd 110V DC system.
That means each larger house would have had +, - and neutral or 3 phases.
I've seen a 1903 advertisement for Municipial Electricity that offers DC in districts 1-9 and 11 to 20, 3ph AC (probably 127/220V) in districts 1, 2 and 10. What happened to districts 21-23 I don't know, maybe they didn't have power back then, though parts of the 21st district are listed for 3ph AC. The PoCo also offered brick lifts, site lighting and arc lights, as well as a large stock of "Nernst lights" specially designed for 220V, white light and huge power savings!
(Taken from an advertisement on the back of a tramway ticket)

[Linked Image from stud3.tuwien.ac.at]

and the front of the ticket for those who're interested:

[Linked Image from stud3.tuwien.ac.at]