Although I do not have a house that would benefit from one of these compact units, we have replaced 3 out of 4 of our homes with the LG 5 cu. ft High efficiency top load no agitator washers & the 7.3 cu ft top load dryer and my cleaners absolutely love them for the large load capacity and the custom drying time ability. 

I have good personal credit (~730-740), average-high personal debt (mortgage, student loans, vehicles,) and I am employed making $90k/year.

Unfortunately you are going to get different answers from different people, especially from Realtors trying to solicit business in their market.What I have been noticing is that even in landlord friendly markets, prices are high.

A heloc is an open end mortgage or in simple terms its a high risk credit line similar to a credit card that sits in 2nd lien position adding another trade line to your credit and reducing DTI.Just like a credit card if you ever miss a payment on any debts on credit or if your scores drop unexpectedly they bank can close or reduce your line of credit.

However, with mortgage rates being so high when I bought, I am worried I will have some negative cash flow (approximately 200-300 per month as a long term).

The rate will be high though. 

Honestly sounds like it is priced too high from what has been said. 

:Class A Properties:Cashflow vs Appreciation: Typically, 3-5 years for positive cashflow, but you get highest relative rent & value appreciation.Vacancy Est: Historically 10%, 5% the more recent norm.Tenant Pool: Majority will have FICO scores of 680+, zero evictions in last 7 years.Class B Properties:Cashflow vs Appreciation: Typically, decent amount of relative rent & value appreciation.Vacancy Est: Historically 10%, 5% should be applied only if proper research done to support.Tenant Pool: Majority will have FICO scores of 620-680, some blemishes, but should have no evictions in last 5 yearsClass C Properties:Cashflow vs Appreciation: Typically, high cashflow and at the lower end of relative rent & value appreciation.

Will check out that book as a high level overview 

.- Continual market analysis to keep your prices neither too high or too low- For software, you'll need a PMS, some system for tracking operations tasks (we use Breezeway), communications tools for internal and external (we use Slack and OpenPhone, respectively)- The decision to self manage or outsource is a very personal one.