The Temple was welcoming and decent. Mike was a helpful caretaker and was receptive to letting me into the building when needed. I was eventually given keys, which made my stay easier. I'd recommend having the keys given by the host upon the guests arrival. I was not offered any breakfast, contrary to the advertisement, and wake up time was strictly 8:00 am regardless of the temple worship schedule (the second morning I was there, there was no morning service but I was still woken up at 8:00 am, which was confusing). The temple is clean, including the bathrooms, but keep in mind there are no showers (as advertised).
The accommodations are very basic, as advertised (I think). I would also add that the guest is basically expected to not be on premises during the day. So, if you are staying multiple nights, don't expect to spend any time there other than overnight. There is space to store luggage and personal items.
The neighborhood is conveniently close to the light rail. So, if you're flying into the Seattle-Tacoma airport, you can get a ticket for $3 to the International District and walk about a half a block, and you're right there (it takes about 30 minutes). The neighborhood itself leaves a lot to be desired, but it seems relatively safe.