We stayed for six nights with a one year old - the house was very comfortable (beds, couches, sheets, etc.), well appointed (blender, hot water kettle, grill, beach equipment, etc.), and in a great location.
You can see the ocean from balcony, it's a short walk to the bay, and close to Mission Beach restaurants & Pacific Beach restaurants. Each evening we'd walk down the boardwalk to Pacific Beach at sunset.
It has a small garage (fit a Rav4, with a little room left over) which was nice to load up when it was raining.
We would absolutely stay again if traveling back to Mission Beach!