We spent two days at The St Mawes Hotel in July over weekdays. It is a lovely, boutique hotel, comfortable and clean with great views over the harbour. It is, however, overpriced for what you get. Our room was lovely, overlooking the sea, but didn't have the amenities you would expect from a hotel costing £250/night. Breakfast was good, but not exceptional, the staff weren't rude, but fairly unenthusiastic and a bit absent! Rooms need aircon - it wasn't even that hot when we were there and we were boiling in the night.
We had dinner at the sister hotel, The Idle Rocks, where the staff were much better, and the food was delicious.