Grand Central Hotel 

Absolutely fantastic experience here. Stayed for 12 nights over September/October, and would 100% use this hotel again. Staff are super helpful, despite my limited Japanese they tried their hardest to make sure I had everything I needed. The check in was effortless, and any required toiletries are available in the main foyer of the hotel. I had to borrow an iron a few times to iron clothes, and they provide an ironing board too which is super helpful. The room was great, for what I needed. Yes, small, but this is central Tokyo so that was expected. The bed was crazy comfortable, and the provided pillow was great. However, if you prefer a softer (or harder) pillow, they have them available in the lobby to collect. Had a great nights sleep. Walls were not as thin as I was expecting, so I was never woken up by neighbouring rooms. Bathroom was fine, using a traditional Japanese "short but deep" bath. Location wise, this place was PERFECT for me. Literal walking distance from Akihabara, and the hotel is within 5 minutes of Kanda JR station which is on the Yamanote line, basically allowing you to get anywhere in Tokyo effortlessly. Also, there are a huge number of bars and restaurants around the local area, as well as a huge number of convenience stores and a number of supermarkets. However, on an evening the hotel still felt safe and quiet, which I thought was quite an acheivement. In general, I will absolutely consider this hotel again if I head back to Tokyo