It rained a lot. It was really bad day for us. Though we checked out of the hotel at 5:30, the steam locomotive was delayed about an hour. We had to wait for about two hours to take pictures of <s>them</s> it.
Furthermore the rental wifi suddenly lost <s>the</s> its connection and we didn’t know where we were. It was very troublesome. On the other hand, the display of Christmas illumination was very romantic and fantastic. The windows of the houses were <s>lightning</s> lit with Christmas candles. It was totally different from Japan. It was a tiring day. I stayed at night in Leipzig.
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I'm not sure what you were taking pictures of. If it was one steam locomotive, you were taking pictures of "it". If there were multiple things, earlier in the paragraph you need to make it clear what was plural.
I'm also not sure if you saw many houses with windows lit, or just one. Usually there would be several houses in a Christmas display where I live, so I changed it, but of you only saw one house, the way you had it was okay.
If you want a prettier word, you can say "the windows were illuminated with candles" instead of "the windows were lit with candles". "Illuminated" makes it sound like there is a gentle glowing light and it is a special occasion. "Lit with" just means something is adding light to a space. A boring office is lit with horrible fluorescent lights. A beautiful restaurant is illuminated with a chandelier.
