You can either update it more, stage it with modern furniture (remove family photos, knick knacks) or drop the price.

Is it too early in the development stages to invest?

I think that you have well intentions of investing some money into this vacation rental but perhaps it needed to be allocation towards professional photography and more staging guides. 

That depends on your arrangement or signed contract.

(Unless if you buy in LLC or trust, but I am not at that stage yet).

I’m not super familiar with these arrangements.

There is no way a seller should be closing without having made moving arrangements before that date in the case of any SFH.

My guess, is that at this stage of the cycle and with the positive growth that Atlanta is seeing, these properties are in D class areas.

The moral of the story is take a good look at which stage your current market is in, look for properties that can add value too, properties that can cashflow as rentals if they don't sell, and if possible buy properties with multiple incomes ie; multi-family, suites, garages that can rent, storage, etc., to minimize risk.

See principal balance.remaining termThe original amortization term minus the number of payments that have been applied.rent loss insuranceInsurance that protects a landlord against loss of rent or rental value due to fire or other casualty that renders the leased premises unavailable for use and as a result of which the tenant is excused from paying rent.repayment planAn arrangement made to repay delinquent installments or advances.replacement reserve fundA fund set aside for replacement of common property in a condominium, PUD, or cooperative project -- particularly that which has a short life expectancy, such as carpeting, furniture, etc.revolving debtA credit arrangement, such as a credit card, that allows a customer to borrow against a preapproved line of credit when purchasing goods and services.