4-plex deal - razor thin or good enuf?

[David de Luna]

I have an opportunity on a 4-plex. Actual current NOI (once the current vacant apt is rented) is 46,117. Debt service looks like it will be about $43,800. CAP rate is 6.6%. DSCR is 1.05. Seems pretty razor thin, but as long as it's fully rented, it does pay it's own way. If these numbers are not good, what would be better numbers for a buyable deal?