We stayed at both of Lei’s apartments in the same building (301 and 401).
We stayed in 401 first and there were a few challenges like the quality of the beds, some flies in the shower/bathroom areas (I think the fan was broken) and an uncomfortable high dining table/island with stools (Japanese apartments rarely have communal spaces however). On a positive note, the location was perfect and the cost reasonable. The shower was also powerful enough and there was a pocket wi-fi which is always useful. Air-con was throughout the apartment.
The 301 was much better. I think it had been renovated more recently and as a result it felt fresher and had no issues with flies. There was a table in the kitchen rather than an island which meant for better mealtimes. The beds were still very thin which caused some sleepless nights. The same positives applied (location/shower/pocket wi-fi/aircon).
In terms of communication, Lei was very communicative and the check in & out processes were flawless. Overall a good experience. With some slight tweaks to these properties they could be great.