Waseda Park vs Shinjuku Gyoenmae – Need help choosing neighborhood

Hello guys!

SO and I will be spending 85 days in Tokyo next January. We have been looking at furnished apartments and have kind of narrowed down the search to this two units, by Hmlet and Weave respectively.

We like the configuration of the Weave unit better, but think that the Hmlet one is better located and has access to better subway lines. In our past travels we usually like to visit Ginza, Akihabara and Shibuya and think that Weave's might be a little far away from those spots.

Any thoughts / ideas / recommendations on these locations?

Thanks!