Garen’s place is good for 3 or even 4 guests. 2 couples + one person can fit as well. It is 5-7 minutes walk from the main street Istiklal. Although there is an uphill and downhill that’s why road seems a bit longer but in reality its very close - generally whole Istanbul is an uphill and a downhill. What I liked is that it is close to the most touristic street while keeps being authentic, with local people, old buildings and few foreigners. Neighbors are a bit noisy during the night. Also, there is a Sunday market on the next street and we enjoyed fresh fruit and vegetables (but careful with the sellers, they may lie to you with price/wight/product).
2 cheap supermarkets Carrefour and Šok are nearby as well. Host is nice and informative. Heating, hot water, kitchen stuff work well.