Last January I visited Sylhet. I resided in an apartment that I rented out via AirBnB. The flat was located in Lamabazar and was in a newly built building called Paradise Tower.
Paradise Tower Main Entrance
The apartment had 3 large bed rooms. Two of the bed rooms were en-suite with hot water. The apartment was on the third floor so it was easy to take the stairs. The building had 24 hour security guards and the guards allowed rental cars to come into the building and wait by the lifts.
The Lama bazar location was perfect as it was 10 min rickshaw drive to Zindabazar.
View from top of Paradise Tower