In addition to hotels already mentioned:
Hotel Europa (downtown, not the Radisson near the airport) = $25.00/hour
Aside from Motel Eden, there are other drive-in (literally) short-time hotels in Barrio San Francisco, including Motel San Francisco. Many offer room service for drinks and snacks, too.
I disagree with C. Dude here. I think that if you want anyplace fairly decent, clean sheets etc. you're actually better off using an ST hotel room... the Asia is nasty, the N. Johnson is a long way from the del Rey. I would agree however that if you're planning to do a lot of one-hour dates, someplace like the Morazan would be a good deal. For a one-shot, just rent a room for an hour at any of the hotels listed above.
Have fun, play safer!
P.