Although this hostel is rather difficult to find, it is worth the search. The members of staff, Kitty especially, are both nice and attentive. We had emailed the hostel beforehand in order for them to help us buy bus tickets to Phnom Penh and arrange a day trip to the Cu Chi Tunnels. Everything was dealt with in a professional and competent manner. The room was pretty basic but at that price we were only happy to have a couple of beds and an ensuite bathroom. Breakfast consists of coffee/tea and a couple of fried eggs or an omelet and bread. Sometimes they put out bananas as well.
A piece of good advice on finding the hotel: Enter the alley to the left of Bali Hotel and turn left at the third alley. Mimis backpacker hostel is the second building on the right. You'll see the sign outside. Although the little lanes may seem a bit shady at first, we were never uncomfortable or insecure about walking to and from the hotel at any time of the day or night.