Couple of things:
Your ROI is at 5.5% - (average for the stock market is 7% and this can be a lot less work than owning a home)
There is no break out for utilities - does the land lord in Denver have to cover anything. I am used to paying for Water, Sewer and Trash. Electric and Gas are on the tenants.
Are you always going to self manage or will you get a property management company - budget on the high end at 10% until you find one and see what they are actually charging.
Insurance seems low to me, I would have figured about $140-160 after you have moved out and its purely an investment property. While you live there it should be higher still. Have you contacted an insurance company to see or is this an estimate from a 3rd party real estate plate form?
Maintenance & Repairs - are you combining the Maintenance and Capex at 5% each. If so, that old of house (unless it was gut rehabbed recently) will require a larger Capex. Cast iron plumbing stacks/sewer laterals, lead or galvanized water lines, fuse boxes/knob & tube wiring, roofing, windows - and if your in a historic district they city/neighborhood will have a lot to say about what you can do and its never the cheaper option. Here in St. Louis, the Cultural Resources Office will make you put in historic looking wood windows that can cost $800-1,500 each vs. vinyl at $400. Also the Repair % will depend on the tenant quality, college students will tend to tear a place up while young families not so much. Also if the house is full of plaster the repair costs can go up because it can unravel from a golf ball size hole to a whole wall if your not careful (I live in a house from 1886)
Not trying to discourage, just laying out some items that I didn't see and don't know if you had factored in.