We stayed at Sonder's for four nights.
Everything was clean. The bed and pillows were extremely comfortable. Even though there were many guests at the hotel, we didn't feel it at all - it was very quiet.
The staff was friendly and helpful.
There was absolutly no problems with parking on the street. Garage parking is also avaiable, but we never used it, as there were always good spots for the street parking.
The location is nice, there can be 1-2 homeless persons wondering around the area, but it felt safe overall. There is a bus stop right near the place. One tip for travellers: I'd recommend taking the Big Blue Bus #1 and #4 to go to the beach or Santa Monica Pier of the 3rd St. Promenade. It costs only 1 dollar (no cash accepted, but you can pay via the mobile app) and it helps saving over 15$ on parking near the beach! :)