You're going to Mayapur, so practically nobody will speak to you in Hindi, everyone speaks bengali, the accomodations are inside the ISKCON complex, you don't ever have to go out except for visiting other holy sites. The temple rules are very strict so no, you won't be allowed to share rooms with the opposite sex. If you want to go out, ask a devotee to accompany you and help you negociate rickshaw prices or you will get cheated. It is good to have a Bengali friend for that, especially since they are great bargainers in the marketplaces, they can show you around all the important sites and translate Bengali writing if you need it.