The Westin is in Ebisu, which offers a lot of dining options close by, there are nice areas to walk to, and there are good train options by the hotel. I don't know if they have a lounge. But if you prefer the W to the Sheraton, probably the Westin is not your style either. They are going for the Old World style rather than the more modern look of most Westins

The Marriott and the Sakura Prince are close to Shinagawa Station, which connections you to anything. The neighbourhood is not super exciting, but there are definitely food to be found, a lot of it chains, but not necessarily chain in a negative sense.

The Sheraton is close to a station, but not the most well connected one. The neighbourhood is nice and quiet, not much to see, but a lot of restaurants within a reasonable distance. I have not been recently, but it did have a reputation for being a bit tired for a while, and I have not heard about any renovations recently.

Despite not having a lounge, I'd suggest looking at the AC in Ginza.