I recently spent 4 nights at the Dolphin Motel and would have to say it was one of the better hotels that I have stayed at, even when comparing it to the major luxury chain hotels. The rooms are small but extremely clean. The staff is extremely friendly and helpful, the owner even gave us a list of his "must see" attractions in San Diego, all of which ended up being worth the time to go see. The hotel has a great location, as it seemed we were about 15 minutes from everything we had planned on doing while we were in San Diego.
Free wifi, free breakfast (muffins, fruit, yogurt, OJ, milk and coffee) and free parking. We will definitely stay here on our next trip to San Diego.