Do you require your own private bathroom? If not, I believe
Hostal López has a single room with shared bathroom. I don't believe they advertise it but it should be less than 30 Euros. Email or call them for exact price. The only unfortunate thing is I believe this room is located right off the reception room and these zones can be a noisy areas at times with all the coming and going of guests. This one is located in the Huertas neighborhood on a pedestrian street.
I also believe that
Hostal Chelo may have one of these single rooms with shared bathrooms as well. It's not advertised on their site but I believe they have one available for under 30 Euros. I think this room is farther away from the reception area. Send English-speaking Antonio an email there and ask. This one is located just north of Gran Vía.
Anyone else have other suggestions? Good luck!
Saludos, MadridMan
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