But my question is that if we consider other operating costs like maintenance, capital expenditure, vacancy, etc then this property won't cash flow, so is this a good deal?

Also asking them how they calculate DSCR and whether its on Pro Forma or trailing 12 financials or tax returns.A lot of times you'll see properties that don't make DSCR on tax returns because the owner might have booked capital expenditures or major maintenance to repairs and maintenance. 

Just remember to factor in management fees, vacancy rates, maintenance, and capital expenditures, as these can really impact your cash flow.

You have the mortgage, taxes, insurance, maintenance, capital expenditures (roof, flooring, etc.), and also need to consider the cost of vacancies or bad tenants.I also recommend you charge market rate, for yourself and the tenant.

The study could also identify the opportunity to capture additional benefits such as dispositions, and repair and maintenance expenditures.

What is your expected reserve for maintenance and CapEx expenditures? 

The numbers you see in pro formas or calculators often don't account for hidden costs like:-Major repairs and capital expenditures (roofs, HVAC, plumbing, etc.)

That's why I posted, to provide people with real advice based on my experiences so they can avoid making the same mistakes.Providing greater buffer space for capital expenditures and controls is a good risk management strategy.

To scale successfully you have to get past the point where your newly increased expenditures exceed your increased revenue; past the point where your ROI allows you to “break even” on your investment, and past the point where the ROI is worth the increased risk, the increased aggravation, time, and “lifestyle” change, and past the point where you can step back from “operations” and concentrate on management.  

Assuming you plan to hold these, you will have capital expenditures.