Try a convent of which there are many in Rome. We stayed at the following last spring at 71,00 per night for a twin room ensuite and breakfast.

Suore De S. Elisabetta (St. Elizabeth Convent)
Via Dell' Olmata, 9
Roma
Phone 011 39 06 488-8271
Fax 011 39 06 488-4066
eamil [email protected]

Hotel Cortina was very clean and very nice. We paid 90 euros. The hotel is a block away from the Republicca Metro Stop (Piazza Republicca). We felt very safe walking late at night.

Their website is www.travel.it/roma/hotelcortina

Hotel Mimosa www.hotelmimosa.net

Behind the Pantheon. I have a res there for 80Euros/night over 3 nights in March. A double room with NO bath.

The proprietors are very responsive to emails.