he lives alone in
Él vive solo en un apartamento.
He lives alone in an apartment.
Él vive solo en una casa enorme.
He lives alone in a huge house.
Él vive solo en su departamento.
He lives alone in his apartment.
Él vive solo en una cabaña en el pantano.
He lives alone in a cabin in the swamp.
He lives alone in the forest.