Hello, I'd like to ask, can I use the hotel reservation form as proof of accommodation for a long-term visa in France?

Yes! But it's not a good deal for you. You have to pay a large deposit in advance, and it will not work for more than three months. How long is your visa application time? The time on your house certificate is at least three quarters. Although the hotel will give you a discount if you rent it for a long time, it seems that no one takes it to apply for a visa.