I booked APA Hotel Akihabara Ekikita for 7 nights. The best is definitely the location.
The location was so convenient, only a few min walk to Akihabara station (you have to go to the right exit, otherwise you'll arrive to the main station which takes a tad longer). You have loads of local restaurants near the hotel and a 7/11 from walking distance too.
The staff was very friendly and happy to help with any of our queries. The room was certainly smaller than european standards but it was self sufficient and convenient. You have space under the bed to store your luggage to make the most of the space.
Cleaning was made every day which was appreciated. We had some weird vomit odour on our floor but kindly asked the reception to double check it.
I also used Yamato to send my luggages from Osaka to Tokyo, and the hotel stored them carefully. They had my luggages upon my arrival, which was perfect.
We didn't have any problem during our stay and made the most out of it, especially it allowed us to discover Akihabara many times!