Los Angeles without a car can be difficult, but not if you choose the right spot to stay! The apartment is 5 minutes by walk from the metro train which connects you without downtown and the other metro lines and also runs safely through the night. Also you are near to Sunset and Hollywood Blvd with frequent busses and a lot of nightlife opportunities like cinemas, concert or comedy venues. Different supermarkets and a lot of restaurants are in walkable distance and the Griffith Park is also very near.
I stayed with the very friendly hosts for almost 4 weeks and we didn't have any problem. They gave tips how to organize the publice transport, what would be nice to visit etc. and I knew that they were always reachable in case of any problem.
The room is quite, spacious and clean. The kitchen and bathroom are not huge, but for sure big enough and well equipped.
I can recommend staying at this place if you are looking for a quite, central room with friendly and interesting hosts.