However, the house requires minor repair work (e.g., several missing railing spindles, a fist-sized hole in one wall, and new carpet for a small section of the living room).

It doesn't need any repairs just to change the living room carpet to LVP.

I agree with @Mark Munson  You really have to verify the repairs and the ARV yourself. 

The property is in a rough neighborhood, but after some repairs it should rent 1200 per unit for 2400 total.

What is the after repair value? 

If I have around 70k liquid cash now and I put in the 47-48k to close, I will be around 22-23k which I would need to do some repairs and maintenance around the home.

If there is no deferred maintenance to start with then you are just budgeting for repairs and dealing with them as they come up.

I need the address, your numbers for purchase and repairs, what your experience level is, etc.

Does anyone have recommendations for an STR on-call service (not full property management), which will handle basic guest communication during their stay and handle organizing repairs (i.e. calling a plumber, HVAC, etc. ... not actually doing repairs themselves)?

@Alan Asriants and I left out expenses like 10% for repairs at 5% for vacancies because I am so skilled at this I have never had a place vacate for less than one week because I keep them ship shape so it moves out.