Only very small things - we received two double beds pushed together that would occasionally separate in the middle of the night, which made for a few awkward moments. (The beds themselves were very pleasant). Also, not really a complaint, but the distance from the Savonlinna city center and the Olavinlinna castle makes this location much more conducive to those with access to a car.
The best thing about this charming B&B was its location smack in the middle of the ravishing Finnish wilderness. Its hosts, Kalle and Laura, tended both property and guests with attention and care. Their morning breakfast was highly reflective of the best of Finnish homemade cuisine, and their lakeside services (barbequing, boating, sauna, swimming, etc.) were enough to satisfy any fan of nature. We stayed primarily because of the great nearby opera festival in Savonlinna, but there's enough to explore at Lomamokkila's wilderness setting to satisfy anybody's curiosity for a long while. While feeling remote, it was adorned with enough modern conveniences (internet, TV, with nearby laundromat, fine restaurants, and a big supermarket) that anybody used to city comforts would not be shocked in any way.