I dunno if you want plaster on those walls at one point or another. If plaster is coming in the future, then it's worth to carving channels into the wall (pic #9), use plastic conduits (pic #10 I think we call these Bergmann tubes), and run the wires around in them. They could be plastered over. Some just plasters the wires in, but that's absolute barbarism. If you won't plaster, then use those white-ish angular wiring channels (pic# 11), they can be screwed onto the walls.
I mentioned single lamp socket. You can reuse the lamp from the wall if you want. If more light is needed at the table (for working on something, reading or whatever) I would support it with a table lamp, plugged into the wall socket by the table. With more than one sockets there electrical devices could be used easily at the spot without the need of running an extension cord.

Here's a wiring diagram (pic #12), which isn't really one, but good enough for me as an illustration of the above. I'm not sure if there's Ground but better be (used green for that). After I was ready I checked the photos and saw, there are four sockets up at the boiler, makes not much difference I think.