When sending an initial home exchange offer message, it does not need to be long or with great detail but it should always be friendly and warm. It's a good idea to draw attention to your location in the first sentence so that the member will read this and be encouraged to view your full listing. Remember to personlise your enquiry message and so, mention their home and location (a little flattery never goes amiss!). Members all have their own styles so write in a way that's comfortable for you but here's an example:
"Hi, Are you interested in an exchange to our stone cottage on the edge of Snowdonia National Park in Wales? Your home looks lovely and is in a location we'd love to visit (or know well – whatever fits). We are a retired couple, flexible on dates we could exchange (again, what fits your circumstances). We'd be happy to answer any questions you have and look forward to hearing from you. Best regards, Joyce and Mike"