I require a high credit score 680+ and two prior landlord references.

It should be pretty accurate - high level data sites are not always going to be perfect, but should always be directionally correct and AirDNA has a pretty strong track record. 

But the answer for everyone may differ.Here are the personal attributes I see in those able to achieve a higher than market ROI, enough higher to be able to “scale”.1- Knowledge of real estate principles, real estate law and real estate finance2- Minimum 3 -5 years full time, or near full time experience directly related to real estate investing3- Ability to utilize technology for increased efficiency, capacity, and accuracy4- Excellent hired legal counsel and excellent hired marketing help5- Established method(s) of obtaining consistently high QUALITY deal flow6- Ability to manage and choose people who are NOT employees: Attorneys, Appraisers, Mortgage Brokers, Real Estate Brokers, Title Companies, Surveyors, Marketing Specialists, Accountants, Contractors, Consultants, Property Managers7- A VERIFIABLE track record of success8- Ability to identify, analyze, and negotiate a deal that can be “worked” for “enhanced” ROI9- Some type of competitive advantage; for example for me it’s my ability to analyze and identify mortgage loans that are actually less risky than all other lenders believe (on the investing in debt side), and on the real property side it’s my ability to analyze”pull the trigger” with LESS information than other investors need,  combined with the ability to pay cash, or raise significant capital almost instantly as well as being able to obtain loans at the lowest prime customer bank rate with no recourse or personal liability.  

The 10% vacancy and repairs, along with 5% capex in my opinion are pretty high. 

To list a few...Anyone who wants to increase their property’s income potential (and equity) and build new housing in a market that struggles with high prices, low supply, and few new construction.House hackers who live in their primary and want to airbnb an ADU love this strategy or vice versaInvestors who want to do both long term and short term benefit from having two separate units.Rental Restrictions on ADUs.Thankfully, Raleigh is very STR friendly and ADU friendly right now.

Is this expected since interest rates are high and listing prices are subsequently dropping? 

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Some of the national data sites have pricing suggestions that run both high and low.

It depends on your financial strength, the quality of the property, how many properties you own, etc.I like to start with one significant expense and three months of vacancy.

Lei, I'd be happy to serve you any way I can.For Ko'olina, I love the Beach Villas (as well as the entire Ko'olina area) and if you are primarily looking for a very quality property for you and your family to use, I'd recommend it.