I feel like we tend to get a little loopy around this time between updates. Next week when the update gets closer we'll get back to sane topics, like speculating about the moon or how many Amis there are.
I presume this is Saki's house, which would connect back to Miu's poem and NiB. It doesn't make sense for it to be Akira's childhood home next to the Nakayamas, though, so I'm not sure how that fits in. Maybe Saki lived in the lake house when she was younger, it stayed in the family, and at some point she moved back and left her kids in the city?
The phrase "same place as always" also applies to the roof during the resets. That's the assumed meaning in the MM note, and Maya has used a similar phrase.
So I'm not sure which direction this event is going to go in, but in any case we should get some good lore clues out of it. I'm hopeful, but not very expectant, that Maya Prime will be involved given her connection with "same place as always" and Nao's involvement in the TSS.