We stayed one week at Maritza's place. Her house is really nice, comfortable and central. If you want to experience whole Havana and not just Havana Vieja it's the right place to stay, because it's located right between Vieja and Vedado. The rooms are very clean, breakfast always fresh and healthy and if you need some tips or help getting from one place to another, Maritza will give you any information you need. You need to speak some spanish though.