Stayed at LK 19 for a couple of weeks in March, only issues we had was the AC unit developed a fault a couple of times, which were resolved by the LK engineers.
Some reviews on other sites mention the lack of lifts on hotel, only time it troubled me was check in/out with heavy case etc to and from 4th floor.
Having said that would quite happily stay again, was close enough to Soi Baukhao and short walk to central festival mall & BigC.
Plenty of motorcycle taxi available for anyone who doesn’t enjoy the walks though.
Good selection of bars & restaurant close by, along with baukhao market.