Hi Naz,
Welcome to the forum and asalam aleukum!
Gemma must be away at the moment, I'm sure she will be able to update you on Mimpi Manis better than I can, but I will try to answer some of your questions.
1. Mimpi Manis is on the island of Lombok - which is a different island than Bali. You can get to Lombok by plane (30 mins from Bali), or by boat (1.5 hours to 6 hours depending on whether you pay for fast boat or go with slow public ferry). Flights are around 380,000 to 450,000 one way, boats range from 35,000 on public ferry to 650,000 by fast boat (one way) - obviously the public ferry is cheap, but you have to travel to and from the harbours which adds to the cost.
Mimpi Manis is located in Kuta, Lombok. So you also need a way to get to Kuta Lombok from the airport or harbour - this can be by public bemo or taxi.
2. Lombok is predominantly muslim so just about all the food is halal. You will need to check with the Mimpi Manis kitchen if eating there - the owners are Hindu so I'm not sure about whether everything is halal or not. If not, there are plenty of halal places in Kuta Lombok, from roadside nasi warung to small restaurants. There is also a masjid reasonably close that does Jumatan in case you are there on a Friday.
3. Kuta Lombok is famous for surfing, also you can go fishing, and chill on the beautiful white sand beaches. It is also quite a good base for exploring that part of Lombok island, seeing local lifestyle, weaving etc
4. Kuta Lombok may not be the best place if you are after live bands - there may be some but not every night. Senggigi would be a better choice if you are after some nightlife. Kuta Bali is more the sort of place if you are looking for lots of clubs and bands.
Hope that helps