I stayed at Simin's room for an entire week and had a very pleasant time. The room and the bed are comfortable. The first night I slept on hard mattress which was too hard for me (personally) so they happily changed it to a softer mattress which was great for me.
Simin and her husband are very quiet people and were helpful to answer any questions I had about the area.
The neighbors are also quiet and there wasn't any noise problem.
The neighborhood is safe and there is also a very nice park (with some ducks) 10 minutes walk from the room.