Hi Retro! You may have had your questions answered already but if not I can go over it a little bit.
1) During the Fall you will take Physio I, Biochemistry, Neuroscience, Molecular Cell biology, and a Research course (which for the Fall is mostly just biostatistics). During the Spring you will take Pharmacology, Immunology, Anatomy, Physiology II, and Research course (here it is a combined Biostats and research grade). The curriculum in the Master's can be considered "med school lite" in the sense that all the courses are taught by the same professors who teach it in the Med school. The pace of the material compared to medical school will be slower, and you will have more time to study for it. You will have classes from Monday-Friday which at first range from 10 AM- 3PM, but then will eventually ramp up to 8 AM-5 PM to prepare for the med school curriculum. The material is almost the same that you see in the med school curriculum so it is a great preview for you as a Master's students. I believe the program was advantageous in the sense of adapting my study strategies and getting used to a fast paced curriculum, which for some of us was a little bit of an adjustment period. Overall, I feel like it definitely helped prepare me for medical school, especially the transition to diving straight into a huge volume of information. The research component is included in the program mostly in the Spring semester, but it's not a fully fleshed out portion of the program. You get the opportunity to do short term research with a professor of your choosing that can continue into the med school year if you would like.
2) I would say the majority of the MSMHS kids get into COM. For my year (graduated Master's in 2018), 30ish people applied, and 27 or so people got accepted. 23 ended up coming to Touro. I would say it may have been similar for the year previous to us. Our class size started at 64, and on average nowadays, the class starts around 60ish kids. About half of them will apply the same year, and the other half apply the next year.
3) I live outside of Vallejo so I can't speak to Vallejo housing prices, but I have heard good things. Most people live on the island because of proximity and price. If you are looking outside of Vallejo, people live in Fairfield, Benicia, Berkeley, Pinole, Hercules. It is feasible to commute and depends on finances and how close you want to be near the school. Personally, I am fine with commuting from Berkeley because I go against traffic so 25 minutes is not too bad of a commute. Perhaps someone can chime in about living on the island or Vallejo.
Hope this helps!