there's a distinct lack of 3 bedroom places for rent just now, I've been looking and it's been a right pain. Seems to be plenty of 2 bedroom places on the go though if you look hard enough. There's always a few in the evening express every day and if you have some patience you could go through the aspc site and then go throgh the solicitor's sits linked from that as well (they often have properties not on aspc). You can also try aberdeen property leasing, thomson properties, letit.net, and various other leasing companies (do a search on google).