We loved our stay at Molly's cottage. Location-wise it was walkable to restaurants and shops on Rainer Ave. Although we opted to drive to because it was unseasonably warm, we had 2 kids under 3, and the walk back would've been uphill. The Link light rail is close by but too far to walk to with luggage. Genesee Park is down the hill and down the street and you can walk to the playground.
The cottage itself is well done; it's efficient, inviting, comfortable, and the attention to detail and thoughtfulness is apparent in the design and furnishings.
We were traveling with a 3 year old and 10 month old and here are my thoughts in regards to them: The spaces and furnishings were kid-friendly; no sharp corners, glass tops, or easily broken knick knacks. We brought booster seats and placed towels on the dining chairs so we didn't stain the fabric.
There are stairs that spiral down to the lower level, a couple steps didn't have a hand rail but my 3 yr did just fine. The infant spent the whole time on the floating stairs up to the kitchen (the treads have a small riser underneath that would prevent a small child from falling through -- either a fortuitous design touch or someone was thinking smart). We moved some tableware out of reach, but otherwise there wasn't much for him to get into. Someone had to watch him the whole time, as we didn't have a baby gate to block off stairs to the kitchen or stairs down to the lower level.
The larger bedroom had space for a pack-n-play, which we borrowed from Molly, plus leftover space for an add'l child to sleep on the floor if necessary. My 3 yr old slept in a PeaPod tent (size large) in the smaller room. It was a tight fit, but doable and he didn't care. The windows have white shades and are not blackout material.
The bathroom has a small tub and enough space to bathe the kiddos.
There is no AC, and typically this wouldn't be a problem in Seattle. But we happened to book our trip during the heat wave and it was in the 90s. The place was warm and stuffy when we got there, but Molly's suggestion to open the windows in the evening and early morning cooled the place off and with the windows shut during the day it wasn't too bad.
I would definitely rebook this cottage. It was really nice to stay in a place that was so comfortable, clean, and family-friendly. Also, Columbia City is a great neighborhood and fun to explore. Pizza at Tutta Bella and grub at Super Six is highly recommended.