Get the garage added to the floorplan.
It's not a standout property, there's no wow from the layout or finish, and there are a few things that can be a turn-off that have already been pointed out - plastic grass, corner bath. It needs to be fairly middle of the road in terms of asking price.
You have had viewings, so the listing is doing its job. You have to ask yourself whether the listing is giving any false impressions, because if you get viewings and their negative comments relate to things obvious in the listing then they are polite timewasters, but if you get 4-5 people saying the same thing or if it's something that wasn't clear from the listing then you need to ask yourself why those people still made the effort to come to a viewing.