Great experience, if you are looking for an oasis of relaxation in the middle of the countryside. A well refurbished old manor with a well maintained park garden and numerous halls and studies. We didn't have a chance to try the Spa but it certainly looked luxurious.
Service was competent and given with a smile, not a given thing in Latvia.

An absolute gem of a hotel in the depths of the Latvian countryside. Stay in the middle of the week as it is quieter - no parties, weddings, etc. Their website is very good at describing what you can expect from your stay and the photos represent reality rather than being stylised. The swimming pool and jaccuzi are good. Just watch your step, as it gets very slippery walking from the pool area to the saunas. Food was excellent for lunch and evening meals, however breakfasts were lousy in our opinion.
Dikli is the birthplace of the Latvian song festival, however there isn't much to look at in relation to this fact. The village church is quaint. Dikli palace building itself is interesting. The owners had saved a lot of old ornate stoves/fragments of stoves and restored them to full glory. Most are in working order. Simply beautiful!
It's about 30 to 40 minutes by car to the seaside. And about the same to the town of Valmiera, but in the opposite direction.
Go to escape the noise of the city life, relax, read, enjoy a swim (additional cost). Be prepared for terrible roads to get there though.
Customer service is outstanding! We felt pampered and very well looked after throughout the stay. Loved every minute of our stay!