I hope you realise that Universal Studios is not in Hollywood and public transport leaves a lot to be desired. When I first went to LA in 1983 I stayed downtown, big mistake, and decided that driving would be too difficult. I tried travelling everywhere by bus but when the man next to me pulled out a knife, to sharpen before use, I decided that a car was essential. LA is 50 miles across from Universal to Disney, it was a two hour journey by bus to Disney, it is your choice but I simply wouldn't go to LA without a car. Good luck