Cottage: The gite had everything you could need. The kitchen is modern and well stocked and the bedroom very comfortable. There is a living room with sofa, TV and dining/games table and chairs. The bathroom is also modern with a good power shower. The garden is also beautiful and is very open to the countryside. We went in August and it was fairly warm and sunny so we don't know whether it gets cold in winter - the floors are stone and it is quite open plan. However it does have a fireplace and thick curtains which would help.
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Service: The owners also live in Rotz and are currently renovating a couple of other cottages (the hamlet only seemed to have about ten though so don't be worried about hoards of tourists!) so they were on site if we needed them. They are very friendly and helpful and happy to recommend places to visit. When emailing before the holiday they were also helpful and quick to reply.
Cost: In August a week at Ti-Bihan cost us £385. Our security deposit was about £100 and was returned in full even though we did break a glass.
Overall: This is a lovely peaceful get away cottage for a couple. If you are looking for seclusion somewhere pretty this is ideal.
Website - http://www.escapesinbrittany.com/