Thanks everyone for the useful advice. To answer some questions, Polly has been to our house many times as the family live nearby but never for a night. We have done some babysitting at her home, so she is used to us. Agree with the point about all the 'stuff' being at P's house. The added complication that I hadnt mentioned is that we have a dog, so if P comes to us it will save us sorting out dog care, although life might be a bit easier without bouncy dog and crawling baby! Good to know there is not one right or wrong answer, and if we decide on home rather than away will suggest she comes here a lot more in the build up.
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) things in my house when she was sitting on the floor or crawling, which is very tiring for you!