You're correct it is la Restauracion, not 16 de Agosto.
If you mean the parada by the chicken joint on Restauracion the guaguas to SFM don't go by way of Moca/Salcedo but rather down to LaVega and back up the 19 through Cenovi. I'd either rent a car for a day or hire a taxi for a few hours. Its on your right as you leave Salcedo toward SFM. There are tall manicured hedges and a small sign. Don't blink or you'll miss it.
I went in November. I believe the cost was around 30 pesos for Dominicans, double for gringos. The guides only speak Spanish, but if you've ever been to any kind of museum in the US you can guess pretty much what they're saying: "Mate's bed... Minerva's books... etc". The tour lasts about an hour unless you arrive late on Saturday as I did, in which case it takes about 25 minutes. Highlights include locks of their hair that Dede saved after they were murdered. I had read the Alvarez book but didn't understand how wealthy they were until I went. They had many conveniences my parents didnt have and most Dominicans still lack. It made the story more interesting for me.
Dede was there on the porch watching CNN. She was very gracious and answered questions for some in my group. I thought it was odd there was no reference to the book or movie, and the small gift/refreshment stand didn't even offer Dede's book, which I found in Centro Leon a couple weeks later. But I guess the point was to leave everything just as it was as a kind of memorial for them. Overall its an interesting, if somber diversion.
Hope this helps.
Chris