There is no given answer here, because the whole property needs to be relatively consistent.Kitchens and baths are the common answer, but if they are passable and you choose to invest in them anyways at the expense of peeling paint (or off putting exterior color) and overgrown landscaping, the appraiser and tenant will be walking up with a bad taste in their mouth, thereby not valuing the interior work you have done.But think about the general flow of someone looking to rent: more bedrooms will typically dictate more rent.  

Generally, you shouldn’t pay off your mortgage early unless you can pay all of it off. it’s better to have it as reserve (in case of lost job etc) and given the typically low rate you can generally get a better return else where.

What kind of deal would you "typically" be able to find.

I'm just more familiar with people quoting gross rents and typically assume the cleaning fees are being paid by guests. 

Mortgage interest deductions are typically claimed by the partnership on its tax return and passed to partners via K-1 forms.

To estimate closing costs and monthly expenses for a multifamily property, closing costs in New York typically range from 3-6% of the purchase price.

For quick and easy, typically check the property sale records and MLS for residential.

Same BRRR method we use for a typical LTR, but better equity, ROI and use( gift it, use it and better tax write offs) 

Snow removal is typically dependent on the amount of snow.  

It's typical to sell 40k programs to people after the free or low money get together.