Marriott is one of the best located in Miraflores, but it's a 5* and very expensive. Miraflores Park (Orient Express) is also a 5* luxury hotel very well located. Hilton Lima Miraflores is just new and conveniently located, not far from Larco avenue. Casa Andina Private Collection too (Casa Andica is a peruvian hotel chain)

Less expensive and well located not far from the main parks of Miraflores (Kennedy park, Diagonal Avenue, Pardo Avenue) are El Pardo Doubletree by Hilton, Radisson Decapolis Miraflores Lima Hotel, and Crowne Plaza. There is also Jose Antonio, San Agustin, etc. I don't have any reference of these, just mentioning cause are very well located. There are also Casa Andina Classic hotels in Miraflores, less expensive than Casa Andina Private Collection.