Historically, stocks have a higher return if measuring stocks appreciation vs home appreciation.

Measure windows.

In order to account for the cost/risk of your rental payment, I would measure it based on ($ cash flow)/($ rent).

I have even washed them between tenants, or for a long tenancy, I just replace them.Just zip in the brackets well (hit a stud) and measure to get the right size curtain, height may be the key with not much space between the top of the sliding door and ceiling.Best of luck.

Early on we had two very similar houses 2 blocks from each other, one with a pool one without and we were able to see the pool house would rent roughly $100 per night and had a higher occupancy, so it was somewhat measurable. 

If you’re local to the home, then there’s a device you can attach to before the meter and you can measure electrical usage.

It doesn’t sound like you had defined criteria going in which would help you measure if this is still a good or bad investment for you.

I refuse to believe that lockdowns and mitigation measures will be with us for an extremely long period, until proven to the contrary.

You can't measure the ROI on relationships.

- How do you measure this?