Here are Sri Lanka properties that consistently receive the highest guest ratings (based on recent guest-review scores and major awards on platforms such as TripAdvisor, Booking.com and Condé Nast). I've listed each hotel, its location and why it ranks highly, with a source you can check.

• Santani Wellness Kandy — Kandy: a small, design-forward wellness resort widely praised for service, food and programming (Booking guest-score ~9.5; TripAdvisor Travellers’ Choice / excellent reviews). (booking.com)

• Ceylon Tea Trails (Resplendent Ceylon) — Central Highlands (tea-country): a Relais & Châteaux collection of colonial bungalows; top TripAdvisor scores and named in Condé Nast Traveller Readers’ Choice. (tripadvisor.com)

• Cape Weligama (Resplendent Ceylon) — Weligama (south coast): cliff-top villas with consistently excellent guest scores and strong editorial praise. (tripadvisor.com)

• Ulagalla by Uga Escapes — Anuradhapura region: award-winning boutique villa retreat with very high guest-review ratings and multiple TripAdvisor recognitions. (tripexpert.com)

• Amangalla (Aman) — Galle Fort: heritage luxury hotel with excellent guest ratings and inclusion on global “best hotels” lists. (tripadvisor.com)

• Jetwing Vil Uyana — Sigiriya / Dambulla area: highly rated eco-lodge noted for sustainability and guest experience. (en.wikipedia.org)

• Jetwing Saman Villas — Bentota: beachfront luxury villas with very high TripAdvisor review scores and Traveller’s Choice recognition. (tripadvisor.com)

• The Fortress Resort & Spa — Koggala / Galle area: consistently strong guest reviews for service, location and facilities. (tripadvisor.com)

• Palmstone Retreat — Kitulgala: small jungle retreat that earned TripAdvisor Travellers’ Choice recognition (top percent of properties). (dailymirror.lk)

• The Kandy House — near Kandy: intimate, highly rated boutique manor-house hotel favored by guests and critics. (en.wikipedia.org)

Notes:

• “Highest guest ratings” can vary by platform (Booking, TripAdvisor, Google) and by time; the list above is drawn from recent awards and high review scores on major travel sites and editorial awards (sources cited).
• If you want these sorted by region (Colombo / Cultural Triangle / South Coast / East Coast), by platform (TripAdvisor vs Booking), or by price/category (luxury vs boutique vs eco), I can produce a focused list with direct links and current review scores.