I stayed at Rantapuisto for one night in September. The hotel (which, by the way, is huge) seems mostly aimed at business conferences, so it was very quiet on a Fri-Sat night. It's in the middle of the woods by the sea, but not very far from the nearest metro station and bus stop. The hotel has its own little beach and a great beach sauna. The fairly small single room was modern, comfortable and clean, and was wired with an internet connection. Breakfast was varied and extremely good, although I had too little time to sit down to really enjoy it. This hotel is not for the party-goer or someone who wants to be close to the city center, but wonderful for someone who enjoys being surrounded by nature. I didn't ask if the hotel restaurant was open when I arrived, but I doubt that it would have been, since it was so quiet.