I stayed in the Radisson Blu Daugava in the beautiful city of Riga in June.
Location: The hotel sits on the River Daugava, on the other side from Old Town. This means it is a 10 minute walk into Old Town, which I didn't mind. However, if you are keen to be central, you should choose a hotel in Old Town, which would presumably cost more. Riga's Old Town is pedestrianised and therefore suits walking.
Check in: A lengthy process, seemed to take a very long time.
Lobby: Felt dated, not a particularly inspiring area to be. There is one computer which has a printer attached, to be used for printing boarding passes and the like. Unfortunately, when I was staying, the same man was on there for over 2 hours, treating it like his own PC. Maybe a sensible time limit could be imposed, as several people were waiting.
Restaurant: Good for breakfast, wide selection of hot and cold food, drinks and pastries. Nice views if you get down early enough.
Room service: Delivered within 30 minutes, always good food and with good service.
Observation deck: Offers stunning views of the Old Town and river from the 9th floor. Well worth a visit, this is the hotel's best unique selling point.
Gym: Good size, plenty of equipment, by hotel standards pretty good.
Swimming pool: Think postage stamp. Absolutely tiny. If you push off from one end, you may get one stroke before getting to the other end. Not big enough for 2 as I found out.
Room: Comfortable, nice big room, good bed, good shower and bathroom.
Overall, a reasonable stay in a lovely city. However, while nothing went particularly wrong at this hotel, it's fair to say that other hotels may have provided a better experience.