Mary's place was fantastic. The location is really unbeatable, considering that it's so close to transit links. There were clubs in that area, but the soundproofing in the room must have been really good because I didn't hear a thing and slept like a baby.
The room was also extremely clean and way, way more spacious than the pictures showed. I was surprised to walk in and see so much space. To give you an idea, I had space to lay out four large suitcases if I wanted to (I had two).
The shared bathrooms and toilets are okay, unless you are not used to hostel living. I didn't want to wait long to use the showers or toilets (if the second floor was full, I just hopped down to the first floor, no biggie). Some of the other housemates left the shared bathrooms in a huge mess, but Mary's staff were quick to clean up the place and leave it spotless again. Check-in is also a breeze and Mary's instructions were clear and easy to follow.
Before you book the room, just make sure you read up about the Hollywood area so that you know what you're expecting. I was fully aware so I knew what a good deal Mary's place was. However, do your due diligence and make sure you know the place can be a bit rough at times. However, I never felt unsafe for one second (even as a single female Ubering back at 3am) so don't feel like it's a 'dangerous' place or anything. I would use the term 'colourful' instead!