I feel your pain. This is one of my hobbies, too, and you’re right, there’s nothing on the Web covering this. You’ll have to do like I did and go down to the library and look at actual books in the “architecture” section.
You live in a famous district for big old houses, so I will bet you a nickel that your local public library will have literally shelf after shelf of books on your kind of house.
Also, Dover Books has a nice selection of reprints covering authentic house plans from the 19th century.
http://store.doverpublications.com/
Generally speaking, the houses in the Haight were built in the early 1900s, which makes them technically “Edwardian”. However, most people simply use “Victorian” to mean those Painted Lady-type houses, with all the gingerbread and bay windows. I’ve never really heard “Edwardian” as an adjective applied to 19th century houses–it’s always “Victorian”, although “Victorian” can cover a lot of territory, from the 1840s Gothic Revival to the 1900 Queen Anne.
The first thing to figure out is whether your house was originally built as an apartment building, or as a single-family house, or as a “live above the store” building. Generally you can look at the staircases. If it looks like there was originally one outside entrance door, a small foyer, and then a stairway going upstairs to an apartment and another entry door into a downstairs apartment, then it was probably originally a duplex. If it was originally a “live above the store” building, then it will have a separate outside entrance and stairway for your second-floor apartment, to the side of the restaurant’s front door.
In a single-family home, all the bedrooms would have originally been upstairs. Only farmhouses of this period ever had a downstairs bedroom–civilized middle-class people slept upstairs. So all the downstairs rooms would have been combinations of parlors, dining rooms, libraries, etc., with French doors here and there. Have you got sliding pocket doors?
They were very big on lots and lots of connecting doors between all the rooms, because the furnace didn’t have a hot-air blower, so heating the house was totally dependent on hot air rising from the furnace in the basement, and the more openings you have between the rooms, the easier it is for the warm air to circulate. If a room only has one door, it’s harder to warm air to get in there.
The kitchen would have been a distinct afterthought, and was frequently located down in the basement, to keep the smoke and smells away from the gentry. There would have originally been one (1) bathroom, upstairs, on the bedroom floor, at the back of the house.
There may have been a maid’s room, on the second (bedroom) floor. It would have been behind a hallway door, so it could be closed off from the “family” bedrooms, next to a smaller back staircase that leads directly down to the kitchen, if the kitchen was on the first floor. Does it look like one of the upstairs bedrooms is smaller than the others, and can be closed off by a hallway door? That’s the maid’s room.
A teeny tiny bedroom, measuring about 6 feet by 8 feet, was a “trunk room” or “sewing room”.