Checking in Without Accident

Today I was moving almost all day.

It took about twenty-one hours from Tokyo to Brussels via Dubai.

I ate airplane food four times in total.

And now, I finally arrived at Leuven, then checked into a hotel with no accident.

I am very very tired but really relieved.

Unfortunately, I couldn't prepare my presentation in the airplane very much, I have to finish it in this hotel from now.

I walked this town only from the station to the hotel, but I felt Leuven was very beautiful location.

I'd like to go sightseeing slowly after the conference is over.

無事にチェックイン

今日は一日中移動していました。

東京からドバイ経由でブリュッセルまで、21時間くらいかかりました。

機内食は合計4回食べました。

そして今、ようやくルーベンに到着し、ホテルにチェックインが完了しました。

とても、とても疲れましたが、本当に安心しています。

結局飛行機の中ではあまりプレゼンの準備ができなかったので、これからホテルで頑張ります。

ルーベンは、駅からホテルまで歩いただけですが、とても素敵な街並みでした。

学会が終わったらゆっくり観光したいと思います。

• And now, I finally arrived at Leuven, then checked into a hotel with no accident.
• And now, I have finally arrived at Leuven, then checked into a hotel without incident.

  Since you start the sentence with "And now," you are introducing the present tense. It's better to say "have arrived" in the present perfect tense. But this makes the second half of the sentence sound awkward.
  
  Perhaps it is better to say "I finally arrived at Leuven, then checked into a hotel without incident."

• Unfortunately, I couldn't prepare my presentation in the airplane very much, I have to finish it in this hotel from now.
• Unfortunately, I couldn't prepare my presentation on the airplane very much, I have to finish it in this hotel from now.

• I walked this town only from the station to the hotel, but I felt Leuven was very beautiful location.
• I walked through this town only from the station to the hotel, but I felt Leuven was a very beautiful location.

• Checking in Without Accident
• Checking in without any problem

• Today I was moving almost all day.
• Today I was on the move almost all day.

• It took about twenty-one hours from Tokyo to Brussels via Dubai.
• This sentence is perfect! No correction needed!

• I ate airplane food four times in total.
• This sentence is perfect! No correction needed!

• And now, I finally arrived at Leuven, then checked into a hotel with no accident.
• And now, I have finally arrived in Leuven, then checked into a hotel without any issue.

• I am very very tired but really relieved.
• This sentence is perfect! No correction needed!

• Unfortunately, I couldn't prepare my presentation in the airplane very much, I have to finish it in this hotel from now.
• Unfortunately, I couldn't work much on my presentation in the airplane, so I have to finish it in the hotel now.

• I walked this town only from the station to the hotel, but I felt Leuven was very beautiful location.
• I walked through Leuven only from the railway station to the hotel, but I felt it was a very beautiful location.

• I'd like to go sightseeing slowly after the conference is over.
• I'd like to go sightseeing once the conference is over.

Leuven is very nice! I visited it when I attended my first conference in 2006. The night life is really good (and the beer too). Enjoy!