I stayed for two nights in a corner view suite/room (or whatever they are called). Irrespective of the exact name, the room was fantastic.

Pros:
- Room very, very spacious (query: Who needs a wetbar in a hotel? Maybe there could a better use for that space?) with nice rain shower.
- Great views over LA.
- Great location for West Hollywood.
- Very nice pool area with great service. Nice to hang out in the afternoon and to meet friends in the evening.
- Very popular with a young and attractive party crowd.
- Very friendly service.

Cons:
- Only one thing - all corridors have a very strange and stale smell. Please a) ventilate the corridors and b) place room perfumes. That's not so difficult (other hotels can do it, too) and would really enhance the experience. The smell was really bad and on all corridors. Otherwise I wouldn't be writing it.

Overall: Still a great hotel where I would stay again, if the rate is acceptable.

This place was great! From the moment we arrived, we received wonderful service. Everyone was very friendly, not snooty at all. Our room was not ready when we arrived (about 30 min before check-in time). They upgraded us to a larger room at no additional charge for the inconvenience, even though we were early. The room was very nice. Everything was in great condition. The shower was great...lots of water pressure and two heads. The toiletries were high quality. The bed was super comfy. Floor to ceiling windows allowed for beautiful views of the hills and the city.
Skybar, the hotel's on-site bar was great. Basically the whole pool area is turned into an outdoor bar/lounge at night. There are cushioned seating areas around the pool, as well as seating near the bar. They have specialty drinks (delicious!), as well as your basic bar offerings. The drinks are a little pricey, but we found that to be the case in all of the higher-end bars in LA. The bartenders and wait staff were all very friendly. As a hotel guest, you get to walk right in and don't pay a cover. It's a great place to get that last drink before calling it a night.
The hotel is on the Sunset Strip and is convenient to lots of bars/restraunts/shops/tourist sites. Many are reachable by foot. Other areas like the Walk of Fame, Robertson Blvd, and the beaches are a short drive or cab ride away. To us this was the ideal location. It was a safe, fun area that was convenient to everything that we wanted to see and do.
Only downside we could find was the parking fee. The hotel parking is valet only and is $33/day. However, the valet service was on point. Our car was there within a few minutes of our request.

Spent a weekend at at the Mondrian on the way home to Scotalnd after 6 nights in Palm Springs. Hotel was fabulous with great room and staff. Very LA cool with lots of beautiful people and enjoyed soaking up the sun at the sky bar pool. We had a fantastic "taster menu" at Asia de Cuba with wonderful view over the LA sky line. However, our evening was not perfect as we had to endure the antics of an Asian family (Mum, Dad & two teenage daughters) who spent the whole evening, whilst seated at the best table in the restaurant, either on their mobile phones or sufing the net on their mobile phones.... GET A LIFE... these people should be asked to leave or better still... kicked out ! Would definately stay again despite this.

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!