Once u go solo, u never go back   
Pasar baru or rumah mode, which is better? 

Should be okay. Just need to be extra careful with local people and keep your handbag/bag safe especially when you go to the famous Pasar Baru. They can recognise Malaysian (by our appearance) and like to follow and force us to buy theirs.

When are u going?

i think recently i read 2 different articles about 2 incidents involving single lady tourist who got raped in Indonesia.
forgot where the location is.

2 reports in the recent days.
unreported? i bet many more cases. dont care where in indonesia, this happens.

so be careful if u decide to go. maybe without a tour guide is better.
if im not mistaken in one incident the guide raped the lady.
another incident is the guard or someone.

this is not your country, u r not familiar, and u are a lady, alone.
rape cases involving single lady travelers, also documented.
so i would say high risk.

i propose not to go alone.
ok i found the news:
http://newsinfo.inquirer.net/659843/indone...chinese-tourist

http://thejakartaglobe.beritasatu.com/news...in-bali-police/

Malaysian gang-raped in Bandung

Trip Advisor page about rape in Bandung