This hotel is really great.
Rooms are spacious, comfortable, clean, large bathroom with a bath (no shower), small fridge in the room. There is no air-conditioning, we visited Sinaia mid-September, so we didn't really needed it. Breakfast is great as well, good variety of fresh fruit, yoghurt, cereals, bread, fresh baked eggs and pancakes etc.
There is wonderful pool but take care it is a 'real' pool where you cannot stand. So for those who actually want to take a swim it is great.
The only inconvenience is the street noise. The hotel is located on the main road. We asked a room in the back of the hotel but they gave us a room in the front. As the street noise continues throughout the night I would advice you to insist to get a room in the back.