We had a wonderful stay at Marty's guesthouse. We were about 12 minutes away from the Santa Monica Pier by Uber, which usually cost no more than $5.
There is also a metro station about 14 minutes away in case there is a high surcharge.
The apartment is lovely, and has everything you would expect in a nice hotel.
The coolest part was his smart lock, which could be unlocked with a phone. That meant we didn't have to carry keys around at all which was very convenient.
Amazing stay overall, I would highly recommend it!