The asking price of £400,000 for a 1-bedroom, 1-bathroom property of 392 sq ft in SW18 seems relatively reasonable. While the lack of comparable recent sales data in the immediate vicinity makes precise comparison difficult, the price per square foot aligns with typical values for the area, considering the condition and size of the property. However, the limited land and potential for some necessary renovations must be considered. Thus, the price can be considered reasonably competitive.

Based on the provided images, the property appears to be in generally acceptable condition, though showing signs of needing some updating and minor repairs. The interior shows a simple finish and the kitchen and bathroom are dated. While habitable, a degree of refurbishment would likely enhance its value and appeal. The exterior is reasonably well-maintained but does not demonstrate high-end features.

The property benefits from being located in Southfields, SW18, which is a desirable area in London. The proximity to several highly-rated primary schools (Earlsfield Primary School and Wimbledon Park Primary School, both rated Outstanding by Ofsted) and good secondary schools (Southfields Academy, rated Good) is a significant plus for families. The presence of multiple train stations within a reasonable distance provides good transport links. However, the lack of detailed information on the immediate surroundings and amenities prevents a higher score.

The property includes a garden, which is a positive attribute, though from the pictures, it appears to be relatively small and require some landscaping work. The small size prevents a higher score.