Yes, Platis Ammos is suitable for swimming. Despite its small size, the beach offers clear waters, typical of the Aegean. The white sand provides a pleasant entry into the sea. While it might not be ideal for extensive water sports due to its more secluded nature, it's perfect for a refreshing dip and enjoying the serene environment. Always be mindful of local conditions, but generally, it's a safe spot for a swim.

For photography and fewer crowds, the best time to visit Platis Ammos is during the shoulder seasons, specifically late spring (May-early June) or early autumn (September-October). During these months, the light is often softer and more conducive to photography, and the beach is less frequented than in peak summer. Visiting early in the morning or late in the afternoon can also enhance the photographic opportunities, especially for sunsets.

Platis Ammos is accessible from Apollonia, though it might require a bit of navigation due to its 'hidden' nature. Renting a car or scooter is often the most convenient way to reach it, allowing for flexibility in exploring Sifnos' more secluded spots. Taxis are also an option. While public transport might not serve this specific small beach directly, you could potentially take a bus to a nearby point and walk the rest of the way.

Due to its small and somewhat hidden nature, Platis Ammos typically does not have direct food or extensive accommodation facilities on the beach itself. Visitors usually bring their own refreshments. For dining and lodging, the nearby larger towns like Apollonia or Artemonas offer a wide range of tavernas, cafes, and hotels. It's best to plan for amenities before heading to this secluded spot.

Platis Ammos is particularly 'Instagrammable' due to its striking white sand and scenic backdrop, creating a picturesque setting for photography. Its small, secluded nature adds to its charm, offering a sense of discovery. The clear blue waters contrasting with the white sand, especially during sunset, provide a stunning visual that is perfect for capturing beautiful and unique travel photos, making it a favorite for those seeking aesthetic appeal.