lags, on the next map (the apartments) we can enter all the rooms, right? And as for the last room in Luna's house, will it be accessible in the future?

 Thanks for all your effort and how's your hand? take as much time as you need :D

Not all rooms are accessible in the apartment level. There was a plan in the past making the second room available after getting Sabrina's message but it was scrapped and she appears in Luna's room.