There are a few premier inns around Nottingham, but the one on Goldsmiths street is across the road from the conference venue. Probably the most cheap but cheerful venue on the list, but also has a Coffee shop integrated within it (which may or may not be important).
There is also a nice Premier Inn (quite new) called the 'Chapel Bar' and is also a 5 minute or so walk to the venue.
Known to many as being the flagship brand of hotelier, the Hilton in the city centre is actually alright, and around a ten minute walk to the conference venue. It is actually next to a shopping centre, and a bit more in the centre of the city.
Probably one for the professors, but this hotel is very nice. I had to actually check up it was actually in Nottingham from the pictures, as it seemed like it was in the remote Tuscan countryside - and, after a walk through the English winter rain - I can confirm that it exists.