We did Arab street, Haji lane and China town at once and went to little India another day. 
But it‘s the best if you do them together, in my opinion, to save a lot of time and focus on other attractions in Singapore. 

First of all, this was my favorite place in Taiwan! I love history, stories and old streets with lantern. We booked a privat driver and a tour guide to fully explore Juifen and our tour guide, which was an older man, middle 50s, told us stories as we made several pit stops at sightseeing spots and he let us be a part of his memories of Jiufen and it’s old street.