A couple of suggestions:

Pullman Tokyo Tamachi is a very nice, relatively new 4-star hotel with incredibly affordable rates - one of the best C/P hotels in Tokyo, IMO. The direct area is a bit boring, but the hotel is a 2-minute walk to Tamachi station (Yamanote line).

https://all.accor.com/hotel/B137/index.en.shtml

The Royal Park Shiodome - decent 4-star, nice views, very cheap rates. Shiodome station is downstairs, Shimbashi station (with easy access to all of the city) is a 5-minute walk. Easy walking distance to Shimbashi, Toranomon, Ginza, Tsukiji.

https://www.the-royalpark.jp/the/tokyoshiodome/