The primary choice for accomodation is Hotel Botânico, a nice and cheap hotel near the University:
http://www.hotelbotanicocoimbra.pt/
Reservations can be made by e-mail:
Please mention you are participating in the QCDNA X conference, so the manager will give you the special rate of 35€/night including breakfast.
Note also that you should book your room as soon as possible, since the hotel has a limited number of rooms.
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Another option close to the University is Casa de São Bento:
http://www.casadesaobento.com/
They offer a reduction of 10% relative to the rates at booking.com
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Near the Mondego river, within 10-15 minutes walking distance from the University, there are several hotels, like Astoria or Ibis.
Other options can be found in the usual websites like booking.com
