I've seen folks charge as high as $5,000 to $10,000 for tax planning and tax preparation, But i also know high quality folks that have fees are around $1,200 to 2k.

Key items to rehab on the second home to bring the property value up for the refi, determining which lenders/servicing companies will be favorable, Identifying good properties to invest in altogether.

They repeatedly charge me for cleaning services while my property has been vacant for 2+ months.

That person is responsible for anyone one else that comes into contact with your property.I suggest using a service like Mayistay.

Make sure it explicitly explains the process for termination if you are unhappy with their services, especially if they violate the terms of your agreement.3.

There are companies such as Cover that offers a full service ADU deliverable from design through construction completion.

Having a lease in place will help you as well - some lenders won't refi a vacant property.For your refi, you're usually looking at 75-80% max LTV with a debt service loan.

They are either a combination of a Maintenance/Tenant Management business or Accounting/Real Estate sales/Tenant management service. 

Just be sure to be prepared to get legal advice if you run into grey areas that you are not well versed in to avoid legal implications.

When a PM does charge a markup, he's usually getting a discount on the service to keep the cost stable.