In my experience as a CPA I find that the tax prep firms have bookkeepers but their primary service is tax preparation.

List your house on a FSBO website, or the flat fee online vendors that you've found and offer you a laundry list of services. 

I am not looking for a free service, I just really have no idea what service to even look for.

That's one of the ways in which those projects are able to provide services to a higher density of units...individual City services are typically not feasible for these projects because they won't meet City requirements for access maintenance etc.

All - I have a "tenant" that had his application approved.

This is a great website that should definitely be utilized.Electronic Locks / Lockbox - Day 1, I have a handyman set up electronic locks on the front and back of the property and set up a lockbox on the premises for contractors.Welcome Letter - Day 1, I provide the welcome letter going over the new ownership and any other applicable information.These should be a good starting point. 

Essentially, I'm holding onto this property for myself and dipping my toes into landlord responsibilities in the interim.However, I'm now unsure if I'm taking the best route, as despite aiming for breakeven or positive cash-flow, the house isn't attracting any applicants.

I would highly recommend full background checks and ensure you understand the tenant/landlord laws in regards to approving and denying applications.  

Pet odor removal services cost between $8k to $10k.

Do your best to mitigate issue before they crop up and annoy residents.Maybe create a free service, for those that are not using your management services, to come and review their STRs for safety, procedures for help etc.