A few definitions that may be useful that are often confusing for new buyers that we use in our MLS (Ottawa):
“2+1 bedrooms: The first number is the number of above-grade (above-ground) bedrooms, and the second is below-grade (floor is below ground level). 2+1 means two bedrooms upstairs and one in the basement or partially sunken level.
“2.5 baths”: Means two bathrooms are full (have a toilet, sink and a shower or tub) and one is a powder room (toilet plus sink only).
“3-piece bath”: Full bath that has only a toilet, sink and shower, but not a bathtub.
“Jack and Jill bath”: A bathroom connected to two bedrooms directly like a shared ensuite for both, but no direct hallway access.
“cheat suite”: An ensuite bath (attached to a bedroom, usually the primary) that also has hallway access. Named because it “cheats” as double duty between a regular guest and ensuite. The cheekier theory behind the name is that it gives a means for a lover to be snuck out of the bedroom when the spouse gets home.
Searching for a one bed, one den apartment is tricky, as most MLS tools (including Realtor.ca) typically don’t let you filter with “den” as a criteria. Your best bet is to include all one and two-bedroom apartments in your target area and look at the descriptions, since den will typically be mentioned in the first line or two of the text, and many 1+dens are incorrectly listed as two bedrooms.
Good luck on the search!
Source: I’m a Realtor in Ottawa, Ontario.