The list price of £900,000 for a one-bedroom flat in Mayfair seems reasonable, considering the prime location and apparent modern condition. While comparable properties in the area may vary in price depending on size and specific features, the price falls within a plausible range for the market. However, the absence of square footage data for comparable properties makes a definitive assessment challenging.

Based on the provided photos, the property appears to be in good, modern condition. The kitchen and bathroom look recently updated and well-maintained. However, the limited number of photos and lack of detail on the overall structure prevents a higher score. Some minor cosmetic improvements might enhance the overall aesthetic appeal.

The property is located in Mayfair, a highly desirable and prestigious area of London. Its proximity to Oxford Street, renowned for its shopping, and various transport links significantly boosts its desirability and value. The presence of well-regarded schools nearby further enhances its appeal to families and contributes to a high location score.

The property has no garden or significant outdoor space, which is common for flats in central London locations like Mayfair. The lack of land is reflected in the low score.