The downside of the secluded setting of the hotel is the transportation to/from the hotel if you are not coming with a car. It is possible to use the metro that brings you about 1.5 km away from the hotel and then take a connecting bus with limited service working days, until approximately 6pm. In the evening and on the weekends, however, you are left on your own: you can either take a rather expensive taxi or walk, which could be challenging with bags on a dark, rainy evening.
Taking into account the excellent network of biking paths in the area and throughout Helsinki, it would be great if the hotel offered bicycles for rent, as the city center can be conveniently and safely accessed by bike. Also, bikes can make the metro station more accessible and if, for some reason, you don't feel like biking, you can take your bike on the train free of charge... It was our understanding, in fact, that the hotel plans to do this during the main tourist season...
The location of Hotel Sofia is great - that is, if you enjoy quiet, natural environment which we did. The forest around the hotel offers a few kilometers of winding paths for exploratory hikes and jogs, with beautiful views of secluded beaches and the sea opening up every now and then.
The hotel staff was friendly and helpful and we felt like we were well taken care of. Our room was simple yet clean and we found everything there that we needed for a comfortable stay. The breakfast buffet provided diverse options to explore even if you stay several days. The hotel sauna was fairly enjoyable after a rainy day, even though the temperature could have been cranked up a bit more for proper sweating.