This is not a mosque as it is a room in a house that can be sold any time or changed into any other room.

If the masjid is about 2 to 3 minutes away from you, you must pray in the masjid.

What are the requirements for a place (say like a room) to be called a mosque? If I always manage to get 4-5 people and form a congregation in the room of my house, but I don’t pronounce Adhan,would I be waived of the obligation of going to the mosque that is 2 to 3 minutes away from my house? Would I get the 27 times manifold reward?