We stayed in Seminyak for a few days in December and found L to be a great accommodation. L Seminyak is a boutique hotel, true in every sense of the word, from the small size yet made up by the amazing service. I know some guests have mentioned problems with the small size; but I'm accustomed as it's pretty similar to hotels in NY. However, you do have to plan accordingly if you travel more than 2 people.
The best parts about L are truly the free shuttle around Seminyak and the wonderful service that Budiman (Hotel Manager) and team continuously extend. When you stay in Seminyak, you really want to be able to use your hotel as a base to shower or drop off your shopping bags before going for a night out. That's when the shuttle comes in handy - no need to show up at Potato Head looking like a sweaty kid! The team is also always happy to help and so very quintessentially Balinese in their friendliness - couldn't ask for a better team.
The only feedback that you should know is the bathroom doesn't have a full separator. It has an electric blind that comes to mid length (but the vanity counter sort of blocks the rest). It's great for those who go on a romantic tour, but for the rest, maybe not so much. Can be avoided by planning accordingly (we booked 2 separate rooms).
All in all, I had a lovely stay in L and if I'm ever in Seminyak again, I certainly would consider going back to L!