Helpful staff, good breakfast, clean rooms. Beware just how small rooms and bathrooms are, though. I have a few bruises from walking into things. Very very very small.
1. The walls seem to be thin. I can clearly hear when water is flowing and people next door are talking. In the mornings it is especially noisy because you can hear the cleaning staff working on the other rooms.
2. The internet is relatively slow (~13Mbps download), with pretty occasional drops. It's sometimes not sufficient for streaming or reliable work.
3. Good price and good location. Close to both the station and Akihabara. Seems like a nice neighborhood.
4. Room size is alright. Slightly on the smaller side but it's acceptable compared to other hotels in Japan anyway.
5. Free unlimited coffee/tea (and maybe other drinks?) at the lobby. I don't think it is 24/7, but almost.
6. Exactly one elevator. Not the end of the world - just pointing it out.