If possible, check online reviews or ratings and, for larger projects, consider a local project manager or inspector to oversee progress.

It's pretty specific, so I'm not seeing too many recommendations online.  

I saw this post online from Kobeissi (which I do like, usually) and just had to comment for perspective.

I work with property managers who are very well connected to the point where my units don't get listed online and average turn time to fill vacancies is under a week. 

Attend real estate investing seminars and workshops, either in person or online, to gain insights and tips from experienced investors.Additionally, strengthen your network of reliable contractors, real estate agents, and financial advisors.

It flips the online story quickly.Safety & curb appeal: Better lighting, landscaping, and visible security changes perception immediately.Small, consistent steps like these can move a C-minus to a C+ surprisingly fast.

Use rent comps, not your realtor’s guessYou can check rents yourself for free:Facebook MarketplaceZillow RentalsRentometerApartments.comIf the rents your agent gives you are way above what you see online, assume they’re optimistic.3.

@Marc HalpernI use QuickBooks Online (QBO) for my flipping business, rental businesses, and bookkeeping clients. 

Work to have conversations about real estate with individuals (in person, online, phone, text, etc) every working day.Best wishes on your journey!

I'd recommend Appfolio since you're managing more than 50 doors (their minimum criteria). 100% of the PMs I've worked with for my own rentals have used Appfolio, and it's always produced great owner reports.For overall bookkeeping/accounting needs, I always recommend QuickBooks Online since my bookkeeping firm uses it exclusively for our clients who are all REIs.But, for a PM company for the trust accounting, I usually recommend Appfolio.Hope that helps!