Rooms: Nice, clean standard size rooms. We got a smoking room as the hotel was full, but you couldn't tell. Small details to show that it is a five star, and a nice bathroom. Cable tv with som English channels.
Bar/restaurant: Nice and cozy bar with stylish interior. The breakfast buffet was lovely and one of the better I've tasted at hotels in a while (and I've worked in the hotel business for 5 years now). The upper class restaurant also served lovely dinner in the evening.
Staff: Very polite and helpful throughout the whole stay. Extra credit to our waiter in the restaurant.
Location: Centrally situated in the embassy area with two nice parks on each side.
Total impression: Without knowing too much about hotel standards in Riga, I would say it lives up to the 5-star classification (maybe in the lower end). I would definately recommend it.