An efficiency when it is used in reference to a hotel room has more than just a sleeping area. It usually has a small kitchenette, and dining area in addition to the sleeping area and bathroom. All of this is usually in one room, except for the separate bathroom.
If you're referring to the main entrance hall its called the hotel lobby.
If you mean can you be nude in a hotel, certainly if you are in your room. If you mean can you go around the hotel nude, only if it is a nudist hotel, which exist.
It depends on the hotel, you would be best enquiring at the hotel you are referring to. And never think of a breakfast as 'complimentary' because the price will be Incorporated into the bill.
he wants to have sex
No it means the room is reserved, it does not infer that it is paid for already. Contact the Hotel and request information if the room was reseved by a 3rd party.
It depends what you mean, if you mean can you rent a hotel room then it depends, i think it is 18 in the UK, but im not sure how old you must be in other countries, if you mean can you go up and collect the key for your hotel room, I think you can, If you mean can you physically go in the room, it depends if you are strong enought to open the door ;P Please give more info in your questions.
Getting a nicer, pricyer room. (normally on a higher floor.)
It likely means room night.
Double room hotel is nothing but the room which has two rooms inside that is called as double room in a hotel.
get a room in a hotel or motel
a hotel room comfortable for twins
A hotel room made for one person.