Does this place secured for long-term parking (e.g., a month) or parking during winter? How will they take care of safety issue?

Yes. River Street is staffed 24 hours a day and has great security. There shouldn't be any worries leaving your vehicle there for long term parking. They have many long term parkers and if you want, you have the option to park indoor.

I believe they do. However, you will have to call for rates and details.

Extended indoor valet parking is available. Call them for rates and details.