I can't comment on the properties themselves, but I can comment on the walk.
For what it's worth, I'm a smallish, middle age female who frequently travels to DLR by myself. I've stayed across the street from the Westin, to the west (Best Western Stovall's; definitely not what you're looking for, ha!).
It's a fairly easy walk. You'll cross the street and go north. At some point you'll need to cross to the west side of the street; this can be done at West St/
Disneyland & Katella or further north at the crosswalk between PPH and GCH. When you get past PPH, you can either follow the sidewalk, or cut through the parking lot. You'll follow the crowds to bag check, then just walk the length of DTD (or grab the monorail).
On the way home, you'll start in Downtown Disney and cut through GCH (follow the signs to thr lobby). Pass though the lobby, follow the sidewalk to Disneyland Drive, and walk the 5-6 minutes to the crosswalk at West St/Disneyland Dr & Katella, as you're right back at your hotel!
It usually takes me 12-15 minutes. It's definitely not a busy walk; I usually see maybe 1-2 other families on the walk. While I'm not a huge fan of the walk because of the limited number of people, it's DLR property the whole way, so I have no doubt there's survalence (sp?) the whole way, so they'll know if I fart the wrong way, haha, so I'm sure they have tape on me if anything wayward would happen.
A taxi could be an option, as would a ride-share, though some ride-share drivers may pass on it because the will only get a few dollars (like $3) for the ride.