Hi Bailey, July and August in Budva are pretty crazy! The old part of the city is beautiful and is also very crowded this time of year. There are really nice beaches, not too crowded, not too far from Budva, but really Budva is a madhouse in July and August. There are also lots of things going on and lots of fun people there, too. Just depends on your idea of fun and crowds of people. There are a couple of hostels in Budva. You can Google them to see the possibility of accomodation there. Calling is also good. Many people rent a room in their house, called sobe. This is often the cheapest way to stay someplace, and is also a way to get to know a local family. If you get to Budva and can stay for a few nights in a hostel, you might be able to find something else more long-term, keeping in mind this is the very busiest time of year. You might also consider Herceg novi which is nice and has a lot going on!
Many people do not speak English, or else speak very little. The more Serbian or Montenegrin you can learn in advance, the better for you! Good luck!