the room size is ok
i lived in the executive tower
you can check the room size and see the photos at its website
many of my colleagues lived there and so far the comments are good
they usually live in executive tower and new tower
i lived there with my son (3yrs old) and my husband
we don't think it's too 迫 or 窄
it takes 5-10 mins from your hotel room to JR station (should be less than 15mins, up to the walking speed and lift/紅綠燈 waiting time)
it's not too far even i walked with my son
besides, the environment on this walk is ok so it's relax and easy
[there's a big zebra crossing between the hotel building and JR station, you may think it's trouble if there's heavy raining]
however, you may take longer JR journey when you live in 品川 to your destinations
last time we found almost all places we went (theme park for kids) were not far from 新宿, which is more central and a big station on the JR route map