Shibutaniku Supōtsu Sentā | 渋谷区スポーツセンター

This is a nice facility - it's located on the basement level but there are large windows, so it doesn't feel like you're swimming in a "coffin". The water was warm but didn't feel as warm as some of the other community pools in Tokyo. There were four lanes for lap swimming and flip turns are permitted. In an Interesting twist, three of the lanes are marked as "no passing" while the fourth lane does allow passing. Smartwatches are allowed (they’re not in most Tokyo pools) but you have to have some sort of "protection guard" which I couldn't figure out.

The previous review mentioned that the attendant gives you a key for the locker. In my case, I purchased my ticket from the vending machine and the lockers required a ¥100 coin (which is returned, when you return the key). When you leave, you give the ticket, which you've saved, to the attendant, ostensibly to make sure that you haven't stayed beyond the allotted two hours.

This is an older but perfectly adequate facility. The staff had very limited English but were very friendly and had pre-printed information sheets in English on hand. The pool is on the lower level; buy a ticket from the machine, give to the attendant at the desk who gives you a key with a locker number. Remember to take your shoes off before entering the locker room. Find your locker, change, swim, dress, then give the ticket and key back to the attendant on the way out. (It's important to keep the ticket... I couldn't find mine on the way out, which caused quite a bit of confusion, gesturing, and multiple attempts at translation by well-intentioned but not helpful passers-by.) There were several people per lane in the morning on a weekday, but it was well organized; I chose the least crowded which involved two "one-way" lanes, i.e., swimming up one lane, crossing over, and then swimming back (which made it hard/impossible to flip turn but otherwise was fine.)