Scanlations for this series have come to a standstill it seems (last update over 4 years ago) so I'll review the ~4 chapters that have been released.
Unlike most manga with similar settings, the story starts off with our male protagonist living a rather comfortable lifestyle. He has friends of both sexes that he can mess around with, classmates to hang out with in and out of school and even a cute loving girlfriend! Naturally, a love rival appears and is integrated into the story. There hasn't been much focus on the plot line so far or rather there wasn't really a solid one to
begin with in the first place. Like typical school based settings, there are plenty of scenes filled with comedy and the cutesy romance scenes are done decently.
The art in this manga was definitely not its strong point. Probably average standards for a ~2008 piece of work. It is good enough to the point where the characters are distinguishable and detailed enough to set the mood and pacing of each chapter. Comedic scenes via character interactions and expressions are adequate and the high point of this work. Could it have been better? Yes. Was it a big deal? No, not really.
Being a short 8 chapter manga, one shouldn't expect heavy character growth and development. Having only read 4 chapters, I suppose there won't be much heavy progress from where I left off either. So it's best to just enjoy the characters as they present themselves currently. We get a variety of characters with fun personalities that are able to play off each other wonderfully. Character interactions and chemistry are crucial to rom-com/slice of life mangas and the characters of Ru~mu! Room No.1301 properly fulfills those needs.
For what it's worth, I seriously wish some scanlation group out there would pick up and finish the series. Either that or I need to spend my time learning the Japanese language and writing system. Not being able to see this manga to the very end left me a bit unsatisfied but there's no helping it I suppose. I still enjoyed the few chapters I've read regardless. So in short, if you do not wish to prematurely end your experience then yeah, I would avoid picking this up but if you have the means to get to all the chapters I'm more than confident that it'll be a decent read.