I'll try to answer your questions but as a one-week-every-few-years vacationer I may not be the best source!
The building we stay in is on the beach. Walk down the hall, down about 10 steps and you're on the sand. (More steps if you are on 2nd or 3rd floor)
There are no washer & dryer in the units but there are coin machines on one of the floors.
Ask for photos and info about the unit you are looking at.
Here are links to a variety of VRBO rental pages:
Myrtle Beach Vacation Rentals by Owner, Myrtle Beach VRBO®, Myrtle Beach Condo Rentals by Owner, Myrtle Beach Vacation House Rentals (http://www.vrbo.com/vacation-rentals/usa/south-carolina/myrtle-beach/myrtle-beach#a5733 - broken link)
Here's a "bird's eye view" of the complex:
Your web browser and the Maps site are incompatible
Shore Drive is a dead-end of sorts, so there's not too much traffic in the immediate vicinity. There are only 2 major roads out to Hwy 17, and these can get pretty busy at dinner times during the summer months. On one of these roads is a Kroger (grocery store) and the other is a Super Wal-Mart and outlet mall. There are several restaurants and beach shops in the area but getting to the restaurants, golf courses, and other MB attractions means you need to get to Hwy 17.
MB is crowded in general, but since these are low-rise units there won't be as many people competing for beach space.
If you are thinking of this for a long term stay keep in mind that the majority of people in these buildings and in the general area (for Summer anyways) are vacationers staying for a week at a time.
Nice area? I think it's fine. We've never had trouble, but you never know. For the money it can't be beat.