That second technique you mentioned @Daniel Ash is commonly referred to on BiggerPockets as the BRRRR strategy. 

I did advertise the house as being rented, but their lease had a clause where we could terminate with 45 days notice.

As someone else said don't forget royalties for the franchisor as well as national advertising.

In your marketing, be sure to advertise "quiet neighbors!"

I think you have a strong small claim court case.My suggestion: keep records of all the work you have done on the property, retain pictures for proof and  have evidence that you are advertising/showing the property with attempts of finding a tenant.Once the property is rented, collect on the amount of funds you are out on past rent + re-renting costs.It's a slam dunk situation assuming you can show she broke the lease and she in fact can afford to pay.To your success!

I advertise washer/dryer hook up but never supply them.

Think they were advertising it on a bigger pockets podcast.

In CO Springs, the advertised rental rate always looks lower than it actually is because of this, so you have to do the same to compete with the other buildings.  

Best way is to go to local rei groups, call rei investors from their advertisements or talk in person at their place of business if you can work for them.

If the inspection revealed items that are not as you want them to be or not as advertised, you should be able to cancel your contract utilizing your inspection objection clause and receive your earnest money back.If you want to move forward, you can try to utilize the fact that one furnace is old, but the difference in price is not going to be all that different.