Ditto AngelFae
I too have to work outside the home and we also try to be very concious of the amount of time we leave our pups. Our solution this time though was to get two (littermates). It was the best decision ever! They keep each other company and really do enjoy each other.
I really don't know anything about the pet apartment. We have our boys trained using pee pads (washable ones - as they can tear apart and ingest the disposable ones) and keep one at the end of the "run". I purchased an Iris plastic pen that can be enlarged (or scaled down by removing panels) and bends to either use as a rectangular run or more of a hexagon. Here's the link:
Amazon.com: Iris CI-908 Indoor/Outdoor Plastic... Have been very happy with it. We keep the door open when we're home and the boys have been known to go in there and sleep on occasion (when not on our laps or piled on our feet
It is high enough that I'm not concerned about them getting out. It's also large enough that they have space to move around. Honestly, when we leave them in there for several hours, they only pee on the pad and not anywhere else. They've used it since we brought them home just before 3 months. It transports easily and we're planning on taking it with us when we take the boys on their first vacation next summer.
Good luck and best wishes with the new family member!