Heh - yeah, we still have the option of the Radisson Centrum (paid with points) but as you correctly indicated, the location is not ideal (although I'm sure it comes with aircon), and other accommodations are not expensive there. So now I'm thinking of staying in someplace in the old town (and saving those hotel points for a future stay at some other city that's more spendy).
If we were there for 4 days, then the 20-30 minute walk to old town wouldn't be a major factor. But I figure we will only be there for an afternoon and an evening (before flying home the next morning), so we might as well stay in the old town, closer to where we would want to spend the little time that we have.
We will be there in mid-July. Not surprisingly, none of the reasonably-priced old town places I'm looking at list aircon as an amenity (one lists "fan" so I guess that means no aircon). I guess it's a gamble on the weather. Hmmm.... I hear Clint Eastwood asking me if I feel lucky...