Omar's place is amazing. You can't beat the location, price and cleanliness. It's only a short walk from King's Cross, which takes you basically anywhere in London. There's plenty of stores around and Omar's place has a fully equipped kitchen (stove, microwave, kettle, fridge, freezer etc.) so you can cook for yourself if you wish. There's also free coffee, tea, milk and breakfast cereals. I didn't think the street noises were particularly bothersome at night, and I barely heard or saw the other residents. The bathroom and shower were always available when I needed them. The room I stayed in was small but had everything I could have asked for (comfy bed, desk and chair, wardrobe, hair dryer, dresser). Wi-fi was free and worked very well. Omar himself was super helpful and friendly.
I truly can't recommend Omar's place enough and will definitely come back. :)