Amazing place to stay, quite small but cozy enough for a couple. Location is close to most areas that we wanted to visit. It's right next to the Tokyo Metro line.
About 20 mins walk from Shinjuku station (JR Line), or 15-20 mins walk from Shinjuku-Sanchome Station (Tokyo Metro).
To get to Shinjuku-Sanchome, Meiji Jingumae (Harajuku) and Shibuya by train without changing lines, we took the Fukutoshin Line (Tokyo Metro) from Higashi Shinjuku station (Which is 2 mins walk from Glou).
The team at Glou speak English so that was a bonus. They were very helpful and accommodating. Would definitely stay here again.