Let's be honest, while the hotel is relatively good you would choose Mondrian because you wanna hang out at skybar (pool or bar) and eventually go to nearby hollywood clubs. The hotel is really noisy due to skybar and you would have plenty of party ppl at 2 am in your lobby! But well I was there for this very reason so I was happy with that! Rooms are actually nice (had a large corner room) with stylish yet warm furnitures. Bathroom was really minimalist (I'm being nice here). One shower, one small sink and the toilet in the between, that's pretty much it. No marble. Oh and they put a tent over over skybar in winter so it doesnt get too cold.
Overall a fun place for a party weekend!