@Thi Dalley Based on your analysis this looks like a good deal. Just make sure you rent to the right tenant otherwise it all goes to heck! Regarding your questions...
1) Take a look at rentals in your area. You want to at least be competitive. I'm assuming since you personally wouldn't pay market rent without a W/D hookup that's indicative of the local market preference. If you want to command top dollar for your rental you need to have a top notch product, right?
2) This is a market specific question as well. I think your best bet would be to reach out to property managers and ask them. Tell them you're interviewing prop. mgrs and drop this question on them. Once you ask a few you should have an accurate vacancy rate range for your area.
3) There's always a risk. The fact that you've actually done the analysis and are now contemplating doing a deal because the numbers make sense as opposed to "a gut feeling" is a huge advantage in your favor. Good luck!