I'm in a very similar place as what you described in terms of square footage, being single person, floor number, and being away during the day. However, I leave 2 grow lights on during the day and keep the thermostat at 70 (winter) and 74 (summer) for a cold blooded pet. My windows are pretty drafty too, even with weather tape.

My average UI bill this year was $65/month. I pay a flat $27/month to my building for water, gas, and sewer. I also pay $47/month for the cheapest Xfinity wifi package (building requires we use Xfinity) and $6/month for renters insurance (required by lease). Best of luck!