Hi Andre,
Its the one that is advertised on the NAC website... last year it was $33 a night which works out pretty good compared to the UK Pound.
During the winter (Jan to April) it is double the price if I remember correctly.
Still more expensive than the condo's but for studying purposes I think I'd prefer the Wellesley.
Not sure what their policy in regards to the maximum stay limit though. You'd need to check that.
Best wishes,
Richard.