To save time for other travelers and alert your attention on loltravel, I summarize my experience in short:
1, loltravel advertised an attractive rate of hotel room, saying the price includes free parking and is refundable
2, the only extra fee to be paid at hotel is U$25
After I paid, the confirmation email repeated above, but the voucher which is supposed to show at hotel says the price does not including parking.
They agree there is mismatching but say they are not responsible for dissimilarities on website, it's third party's job. I called the hotel directly, the hotel said they don't know why the website described the parking is free in 4 occurrences, asked me to check with the website and told me the resort fee is U$33.75, not U$25 as stated in the voucher provided by loltravel.
Loltravel suggested to provide 20 Euro discount for my next hotel booking on loltravel if I keep this reservation and after I check out. Otherwise they suggest me to cancel the reservation but they may keep me 2 months to wait for the refunding. While the rate of other hotel rooms is increasing with the time.
To make it worse, they arbitrarily modified customer's existing booking on their website!
If you don't want to go into this kind of dilemma, please be cautious on loltravel.