Tokyo Dome Hotel is a good place to stay and I would recommend that anyone visiting the city considers it. It is in an excellent location, next to the Tokyo Dome itself (obviously), some shops, a funfair and a railway station. The hotel is very clean and tidy and the rooms are bigger than I expected. The staff are very professional and friendly but for international travellers, be aware that very little English is spoken in the hotel. To be clear, I am not saying everyone in Japan should learn English, of course not, but when I compare it with similar hotels in China, the level of English is low.
I didn't use any of the hotel's facilities as I was always out, but there are plenty of places to eat inside the hotel that are worth investigating. The rooms all have good views of the city with big windows, which is another positive. I found the hotel to be quite good value and I would definitely stay there again. While the decoration, especially the bathrooms are a bit dated, everything is good quality.
There are two negatives, depending on your perspective. The mattresses are quite firm. I slept well so this didn't bother me personally, but I could imagine them being too firm for some people. Also, the hotel uses the cheapest, lowest-quality toilet paper I have ever seen. Obviously not a huge issue, but it is so strange considering how nice everything else is.
Overall, I would happily stay there again and recommend it to others.