I know you have high expectations because it's your honeymoon but I think you're over reacting a bit.
£1500 for two weeks in August does not buy luxury.
The agent can send someone to wash crockery, replace BBQ, air cot bed and fix tv aerial.
It may be that the last clients broke the aerial and BBQ, and the owners were unaware. If they also left the house messier than usual then the cleaners may have had their work cut out, which might explain the crockery. If the cot bed hasn't been used in awhile, then nobody will have noticed it getting damp.
None of this is your problem of course, but give them a chance to put things right. I'd be surprised if the owners, and the agents, didn't care that it was your honeymoon, and also about any resulting bad reviews.
The parking situation must have been clear from the cottage description, but isn't the end of the world.
A bedroom smaller than you expected is no reason to cut your holiday short.
I hope you stay and enjoy your honeymoon OP.