Overall, Glou is a pretty good pick for a basic room considering its price and location.
One thing to note is that Glou is basically an apartment building with hotel-style rooms. That means that your room is tidied up each day but you won't get typical amenities that you would get from either an apartment or a hotel (kitchen, 24/7 desk clerk, gym, etc).
My own room was pretty small, just big enough for a double bed, a cabinet and a bathroom. There wasn't a whole lot of space to walk around.
Considering the location (about 10-15 minutes from Shinjuku station walking, and super close to the Fukutoshin metro line) and the price, I'd say that this place is a pretty good value if you're just looking for a decent place to sleep in the Shinjuku area.