I stayed 2 months at Jimena's and it was really pleasant. It's an older building with thick walls on a fully residential block and the apt is surprisingly quiet for being street-facing. I work from 7pm-8am so sleep during the day and had no trouble doing so, even with the windows open. THAT'S how quiet the block is. It's very close to the subway as well as several buses; groceries, a Walgreens, ATM machines, restaurants and a great 24h bagel/sandwich shop are all within easy walking distance. This is not a slick hipster neighborhood. It is a quiet, friendly, family-oriented (and very safe) residential neighborhood. Staying here is a wonderful way to see a slice of real classic NYC.
You can do your laundry in the building using the coin-op machines in the basement or you can drop off your laundry at the corner laundromat for a very reasonable price and save time. The entrance to Prospect Park is only two stops away by train - so easy. There are plentiful Citibikes to rent in the neighborhood and at the park if you like. The delightful Nitehawk Cinema is also right at the PP entrance where you can watch a current run movie with food and beverages brought to your seat . The apt is clean and well stocked with sheets & towels and basic cooking supplies. Very comfy bed, excellent water pressure in the shower.
Because it's an older building, there are Old Building quirks and noises you should know about. They didn't bother me in the least, but anyone unfamiliar with old NYC buildings should know: steam radiators hiss and clank (and put out A LOT of heat) in the winter, and the toilet flushing sounds are mighty and audible from other apts up the line. Aside from that, it's truly quiet.
Jimena was a responsive and informative host who was quick to return messages. My stay had some major maintenance/plumbing issues that required my time and attention - it's an old building, these things happen - and Jimena worked with me to come up with fair and reasonable solutions. Check in and check out both had logistical issues but again we worked them out.
I'd certainly recommend Jimena's space for long stays and would absolutely stay there again if the price was right (dynamic pricing is in place, and highly unpredictable because it's demand driven.)