Do the credit check. It is not that expensive, in the scheme of things. I really wish I had done that for my prior tenant... I only called the references...
Call employer to verify employment history / currently employed matching what they told you.
Call current landlord to find out if they paid on time or caused any nuisances.
(Boardwalk, and the other big property / rental companies on Calgary, will only tell you if a current client is leaving on good terms or was asked to leave, fyi. Asked to leave means that they did not pay rent on time or missed payments..but they don't give that detail or ANY detail.. I don't think Boardwalk would send someone packing for being noisy..)
Also, ask yourself if you priced near the top or bottom of the rental market.. That will be a sign for how hard it may be to get a good tennant. We were priced about fifty dollars a month high, although the condition was great of the unit, that dissuaded the good renters. good tennants do not pay over market for great condition, they pay market and are choosy.