I'm a British-Italian (English mother tongue) living in Rome and would be happy to consider translating your booking. However the average cost for a project this big is around 11-14 (EU cents) a word.
At 20,000 words, I could do it at a rate of 9 cents a word, making the total cost 1800 euros (1981 USD at todays exchange rate) for 20k words.
If there are more words, the price would increase. Please keep in mind 10% would also be taken by Freelancer.
A week deadline may be possible, but I would ask if you could be slightly flexible as in some cases additional time might be required, especially to re-read and quality check the finished item. I suspect the project would be complete in less than 2 weeks.
We do have other clients who we have translated multiple press releases and publications for. Also, we only work in English and Italian.
If you are looking for lower cost option, we could provide a "machine translation" with a light review for about half the price, but the quality may not be as good as human translation.
Please let me know if you have any questions.