We really loved staying at Hiro's apartment. Out of all the apartments we stayed stayed in Japan it was the most "non-Japanese" friendly, with clear indications for things (don't underestimate trying to operate a Japanese washing machine!), cutlery, a welcome pack with tons of useful info about places to see and things to do.
If you have large suitcases I'd recommend getting a taxi from Shinagawa station as it's a little uphills.
When we arrived the apartment was being cleaned but we could leave our luggage as Hiro's parents live upstairs. They were kind enough to put our luggage in the apartment for us.
Hiro went really out of his way to welcome me and my son, he walked us to the station to explain where to catch a bus/metro and gave us useful tips including for a sushi restaurant where we went at night (delicious). He even left some manga in the room as I told him my son liked them.
The apartment itself is comfortable and has everything you need: hairdryer, washing machine, microwave, a sofa and a little table with stools (in most houses we had to way breakfast standing or sitting on the floor). It's on the ground floor and on the little road itself, but no cars and Japanese people are so respectful that you are not bothered at all. Shampoo and conditioner were also provided. The toilet is not the usual technological kind you find in Japan but for us it's the norm so no problem there at all.
The only slight problem is that walls are really thin so you can hear people moving about upstairs, and they equally can hear you I guess. Still that is not a big deal.
The apartment is 10 minutes walk from Shinagawa station but in a quiet road.
I would really really recommend it, especially when arriving to Tokyo for the first time as this apartment will introduce you to Japan in an easy way.