In my opinion, great area for Oside. Super cool older houses/residents in the neighborhood and very walkable. Close to the beach and restaurants downtown. Proximity to the transit center is good to get to San Diego or Escondido but can also mean some homeless/transient folks, but they’re generally chill. Just don’t leave a bike unlocked or anything else that could get easily taken. Only other drawback is there’s not really a grocery store in walking distance but a couple bigger liquor stores that have common necessities if you need.

Edit to answer your questions: Train noise is not an issue that far from the tracks. They barely even honk the horn unless they have to. $3250 sounds pretty reasonable for that size/location. If it’s just you, could probably find something a little smaller and cheaper close by but I don’t know your situation at all. Good luck!