Staying in mixed dorms hostel is quite an adventure. In hostel you are sharing the bedroom, bathroom and kitchen with other people, but hostels aim to provide safe and comfortable low cost accommodation. If you decide to accommodate in hostel, you are aware, that you do not have such privacy like in hotel.
In general, staying in hostel is a good experience. You can meet some cool people there. Mixed dorms hostels may not be suitable for everyone. It also may depends on case. When you are staying in hostel, it is recommended to store the most valuable stuff in a locker.