Personally, if you’re still in the cooling-off period I’d ask for an extension to permit you to commission Strata and Building Inspections to, amongst other things, ascertain the facts surrounding the issues as opposed to what the vendor’s agent believes to be the case.
If the vendor won’t agree to that, then I’d walk away because unless leaks, which may or may not be from a pipe, are in a common wall (i.e. on the unit’s perimeter) then rectification is the owners’ responsibility, similarly with the floorboards unless they’re original (i.e. with the building), I’m suspicious that 5 year old professionally completed renovations would have omitted waterproofing, and that any resident owner would not press for repairs; unless of course they’re an absent owner/landlord and/or been told that they’re responsible for all or some of those repairs.
Come back, if possible with some additional information, if you’re already committed to the purchase, because there are other options, albethey possibly less certain in terms of outcomes.