3 rooms $600-$1000 / 10 minute walk to Oak Grove T

Three bedrooms for rent, $600, $800 and $1,000 per month + one month's security deposit. (Four tenants (four bedrooms total) pay landlord $3,200 monthly, collectively.) Utilities not included.
The room for $1,000 is very large and also has two attic spaces that are accessed from within the bedroom; one attic space is small, the other is as large as a walk-in closet. Photos are of this larger room.
The room for $600 is comparatively small and one for $800 is mid-sized.
Rooms are unfurnished.
One shared bathroom.
Apartment is in a house in a suburban area. 10 minute walk to Oak Grove T station; 15 minutes to Malden Center station.
Full kitchen, washer dryer, internet. (Wi-Fi in bedrooms is excellent.)
Parking available.
Available December 1st. (The larger room may be available in late November.)
Three housemates will be moving out at the end of November; remaining housemate is female.
Length of stay is variable.