How long have you been working on that? 

Can anyone advise based on their experience which will be cheaper in the long run?

It has a free plan, although I opted to go for the long dollar and spend $7 a month so I can make use of its automated workflows :)Do a quick search and check it out; perhaps it'll serve your needs.

We run a debt fund and focus on short-term mezzanine funding mainly. 

I live in Los Angeles, so it makes things tricky in terms of flips and in-state investing.

I've found Kiavi a bit better for the short term fix & flip (lower fees) and LendingOne a bit better for the 30 year DSCR (lower rate). 

It was pretty long and basically barely found one and it still all boils down to insurance. 

So rather than selling $10-15k of  investments, couldn’t I get a short term loan to use to pay bank back?

That always makes it so much harder to rent, or secure a great tenant.Here's my standard go to list now for long term rental updates:-LVP that looks like wide plank white oak-Ultra Pure white on all the walls-Vertical/ modern stack backsplashes and showers-Pop of color on the cabinets (pop of color can include black too)-Butcher block countertops (lower end) or white quartz countertops (higher end)-Modern light fixtures in brushed brassKeep it neutral still but a couple of style choices with the light fixtures (which are cheap) and it will appeal to the masses.Good luck! 

But as of now, just a long term, high yield savings account.