Do not underestimate the importance of smells. For example, a pet may be chronically incontinent and make the house smell a little unpleasant.
Especially if the owner is a smoker or has pets, the smell may not bother him/her much since he/she smells it on a daily basis. It may be a good idea to ask the real estate company entrusting you with the sale, or a friend, for their honest opinion. Odor problems are difficult to understand in advertisements on websites, but there is a risk that they will be pointed out by potential buyers at previews. Be sure to check for odor issues as soon as possible.